INMO 2019 Discussion

This is the place where we may discuss various problems and get updates of INMO 19. I expect the students of different states to post some problems discussed in their INMOTC. I will regularly upload some problems and even practice tests for INMO and expect you to do so too. Hope we all do perform well in INMO and many of us may even get selected for INMO IN MY NEXT POST, I WILL SEND A MOCK TEST A BIT EASIER THAN INMO, AS IT IS JUST THE BEGINNING.

Note by Maalav Mehta
7 months, 3 weeks ago

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</code>...<code></code> ... <code>.">   Easy Math Editor

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Inmo provisional scores are out!!

N Kansara - 6 months, 1 week ago

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What is your score? Mine is 16, Samip 19, Pritesh 29, tanishka 14 are the scores I know till now from GUJARAT

Maalav Mehta - 6 months, 1 week ago

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My scores look messed up. I could solve P1 and P2 and attempted P6 (almost pseudo proved it), but I got only 7. If there are 5 marks for attempting P6, then I was given only 2 marks for 2 correct questions. What the hell!

SRIJAN SHASHWAT - 6 months, 1 week ago

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@Srijan Shashwat P6 deserved to be deleted. Anyway, better to file RTI to get the truth about evaluation.

Suchir Kaustav - 6 months, 1 week ago

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@Suchir Kaustav I do agree. I made assumptions in P6 due to lack of options. Anyways, though I felt Functional Equations was my stronghold and I wasted a lot of time in that question, my best wishes to all who did really well. Hope India succeeds this time at IMO.

SRIJAN SHASHWAT - 6 months, 1 week ago

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I am Param Kansara and I got 26 from Gujarat

N Kansara - 6 months, 1 week ago

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Who is pritesh

N Kansara - 6 months, 1 week ago

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@N Kansara My friend from class 9. He studies at Allen

Maalav Mehta - 6 months, 1 week ago

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1st Indian National Mathematical Olympiad MOCK 2019 Time: 4 hours Instructions: • Calculators (in any form) and protractors are not allowed. • Rulers and compasses are allowed. • All questions carry equal marks. Maximum marks: 102.

1.A circle passes through the vertex C of a rectangle ABCD and touches its sides AB and AD at M and N respectively If the distance from C to the line segment MN is 5 units, find the area of ABCD.
2.Consider the set {3,5,7,9}. You can choose any 2 numbers a,b and replace them by (4a+3b)/5 and (3a-4b)/5. Prove that you can never get the set {2,3,4,9}.
3.A 3*3 square is said to be a mystic square if i)Its entries are from 1 to 13(both inclusive, repetition allowed) ii)The sum of any row, column or diagonal is always divisible by 13. Find the number of MYSTIC SQUARES.
4.In a triangle ABC, AB=AC and angle A is 20 degrees.D is chosen on AC such that AD=BC.Without using trigonometry, find angle ABD.
5.Let P(x) be a cubic polynomial function with positive coefficients..Prove, if -1≤P(x)≤1 for all x such that -1≤x≤1, prove that sum of coefficients of P(x) is at most 7.
6.Find all functions f:R to R which obey
f((x-y)²)=f(x)²-2xf(y)+f(y)²

Maalav Mehta - 7 months, 3 weeks ago

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Thanks for the mock test!!! What are you focusing on preparing??? Geometry??

Aaghaz Mahajan - 7 months, 3 weeks ago

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I want to improve at geometry, but I hate doing it.

Maalav Mehta - 7 months, 3 weeks ago

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@Maalav Mehta Well, you can start off with some problem solving on AOPS..........BUT, if u want to learn new stuff, the wikis on Brilliant are REALLY good ones...........

Aaghaz Mahajan - 7 months, 3 weeks ago

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@Maalav Mehta Also, if u hate doing it, then focus on something which you like doing and prepare that.......:)

Aaghaz Mahajan - 7 months, 3 weeks ago

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Which state are you from?

Maalav Mehta - 7 months, 3 weeks ago

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@Maalav Mehta I am from Noida..........(UP region).....You???

Aaghaz Mahajan - 7 months, 3 weeks ago

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@Aaghaz Mahajan Gujarat

Maalav Mehta - 7 months, 3 weeks ago

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@Maalav Mehta When is your INMOTC and which teachers are coming?

Maalav Mehta - 7 months, 3 weeks ago

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@Maalav Mehta WHOAH!!!! You have an INMOTC???!!! That is great dude.........yahan pe to aisa kuch inform nhi kara hai!! lol............

Aaghaz Mahajan - 7 months, 3 weeks ago

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@Aaghaz Mahajan You may ask your coordinator to arrange some camp or you may enquire in neighbouring states if they allow outside students

Maalav Mehta - 7 months, 3 weeks ago

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@Maalav Mehta All the best for tomorrow

Maalav Mehta - 7 months ago

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@Maalav Mehta Thanks!!!! Same to you!!

Aaghaz Mahajan - 7 months ago

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What about the last question in INMO 2019? Since the question was faulty, how will the marking be made?

Somaditya Santra - 6 months, 2 weeks ago

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Should simply be ignored and marks be awarded to none.

Suchir Kaustav - 6 months, 2 weeks ago

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But that is not correct as many would have spent hours on the problem as no one would have expected it to be incorrect. On the other hand, many wouldn't even have tried the question. It is unfair that both get 0 marks

Maalav Mehta - 6 months, 2 weeks ago

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@Maalav Mehta i feel that someone who has tried to draw logical steps from the given statements in the problem should be awarded marks. Someone who forcibly tries to prove the false statement to be true must not be awarded marks. I really doubt if someone actually tied to disprove it.

Somaditya Santra - 6 months, 2 weeks ago

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Let us post our scores Mine is 34

Amol Borade - 6 months, 1 week ago

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my score is 54

Shirish Chinchanikar - 6 months ago

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You will get selected for sure

Maalav Mehta - 6 months ago

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but last to last year the cutoff was around 60

Shirish Chinchanikar - 6 months ago

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@Shirish Chinchanikar But this time it is not so. Check out aops

Maalav Mehta - 6 months ago

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@Shirish Chinchanikar It was 47

Anubhav Mahapatra - 5 months, 4 weeks ago

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Congratulations man!

SRIJAN SHASHWAT - 6 months ago

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thanks!

Shirish Chinchanikar - 6 months ago

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Which region are you from?

Maalav Mehta - 6 months ago

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maharashtra goa

Shirish Chinchanikar - 6 months ago

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@Shirish Chinchanikar pune

Shirish Chinchanikar - 6 months ago

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@Shirish Chinchanikar Were you merit holder, because in the lost I can't find someone from Maharashtra having 54 marks. There is one with 58 though

Maalav Mehta - 6 months ago

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@Maalav Mehta yes

Shirish Chinchanikar - 6 months ago

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@Maalav Mehta What is 'lost'

N Kansara - 6 months ago

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@N Kansara sorry, I wanted to write list

Maalav Mehta - 6 months ago

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@Maalav Mehta Which list?

N Kansara - 6 months ago

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@N Kansara It is on aops

Maalav Mehta - 6 months ago

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@Maalav Mehta But where?

N Kansara - 6 months ago

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@N Kansara https://artofproblemsolving.com/community/c260h1781370 See the first post

Maalav Mehta - 6 months ago

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@Maalav Mehta Thanks, what is your name in aops

N Kansara - 6 months ago

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@N Kansara Math-Wiz

Maalav Mehta - 6 months ago

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Final scores are out. When do you expect the list will be revealed?

Madhur Agrawal - 5 months, 3 weeks ago

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What should be the merit cut off?

Suchir Kaustav - 5 months, 3 weeks ago

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I have no idea. 30-50 somewhere

Madhur Agrawal - 5 months, 3 weeks ago

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40

Maalav Mehta - 5 months, 3 weeks ago

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Find all functions f:R→R satisfying the equation f(f(x)) + f(x) = 6x

Maalav Mehta - 7 months, 2 weeks ago

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ALL THE BEST FOR TOMORROW GUYS AND GIRLS!!!!!!!!!!!

Maalav Mehta - 7 months ago

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Same to you!!!!

Aaghaz Mahajan - 7 months ago

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How did it go????? How many could you solve????

Aaghaz Mahajan - 6 months, 4 weeks ago

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None

Maalav Mehta - 6 months, 4 weeks ago

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@Maalav Mehta Really?

Aryan Arya - 6 months, 4 weeks ago

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@Aryan Arya Yes

Maalav Mehta - 6 months, 4 weeks ago

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@Aryan Arya What do you expect from a class 9 student?

Maalav Mehta - 6 months, 4 weeks ago

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Do you think that the cut off may be lower this time since as per my experience this year, the paper was relatively tougher

Shubhraneel Pal - 6 months, 4 weeks ago

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Yes, the cutoff will be around 35-40

Maalav Mehta - 6 months, 4 weeks ago

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Greater than 42..check out AOPS

Anubhav Mahapatra - 6 months, 1 week ago

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@Anubhav Mahapatra What is your score? Any chances of selection?

Maalav Mehta - 6 months, 1 week ago

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@Maalav Mehta No...I didn't do well...In Odisha highest score is 39 by Aatman...Most got single digit scores.however from the checking it is clear that if even a single step is wrong or a claim too you end up with a zero in that question

Anubhav Mahapatra - 6 months, 1 week ago

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@Anubhav Mahapatra Even in Gujarat the highest score is 29 as known till now(no idea about merit holders). So, no chances of selection in Gujarat

Maalav Mehta - 6 months, 1 week ago

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Hey everyone. I appeared for INMO 2019 and solved P2 and P3. In P6, I managed to provide a "pseudo-proof" that f(x,y) =1. What are my chances of selection? Also, I couldn't solve P1 but I heard many saying that it was the easiest problem. Is this really the case?

Vibhav Aggarwal - 6 months, 4 weeks ago

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Hey dude........same case over here...........I mean even I have done the EXACT same things except P6, in which I was only able to prove the first part..........Oh well.......Chances are slim...........And Yes, P1 was the easiest......IDK why it did not strike me during the exam........!!!!

Aaghaz Mahajan - 6 months, 4 weeks ago

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Can you provide a hint for P1?

Vibhav Aggarwal - 6 months, 4 weeks ago

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@Vibhav Aggarwal Well, Allen has already posted their solutions, but my method was using a lot of trigonometry...........You know, Sine rule and Cosine rule........and that took me too long.....

Aaghaz Mahajan - 6 months, 4 weeks ago

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Btw, which class are you in?? And from which state??

Aaghaz Mahajan - 6 months, 4 weeks ago

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I am in 12th class from Rajasthan state. What about you?

Vibhav Aggarwal - 6 months, 4 weeks ago

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@Vibhav Aggarwal Ohhh I am in class 11th.......Uttar Pradesh........

Aaghaz Mahajan - 6 months, 4 weeks ago

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@Vibhav Aggarwal So, you are giving JEE???

Aaghaz Mahajan - 6 months, 4 weeks ago

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@Aaghaz Mahajan Yep

Vibhav Aggarwal - 6 months, 4 weeks ago

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Did you hear that P6 was wrong? What would be impact. Will it be deleted or there could be a reexam??

Suchir Kaustav - 6 months, 4 weeks ago

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Check it on aops

Maalav Mehta - 6 months, 4 weeks ago

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@Maalav Mehta What do u think? HBCSE will delete the qn?

Suchir Kaustav - 6 months, 4 weeks ago

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@Suchir Kaustav Probably, but that is not correct as many would have spent hours on the question without knowing that it is incorrect

Maalav Mehta - 6 months, 4 weeks ago

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@Maalav Mehta What could be the cut off? I guess, it should be around 40-45.

Suchir Kaustav - 6 months, 4 weeks ago

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HBCSE has provided an update on their site: "In question number 6 of the INMO2019 held on 20th January, 2019, a hypothesis was unfortunately left out inadvertently. As a result, the problem was incomplete. A suitable resolution of the problem will be worked out in consultation with examiners and students’ efforts will be taken care of during the evaluation. — B. Sury, National Co-ordinator."

Vibhav Aggarwal - 6 months, 3 weeks ago

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@Vibhav Aggarwal Yup........maybe they'll mark it correct for everyone and thus increasing the cutoff........

Aaghaz Mahajan - 6 months, 3 weeks ago

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@Aaghaz Mahajan No they probably won't do that. I think they will give 0 for no attempt and provide some marks according to the attempt.

Vibhav Aggarwal - 6 months, 3 weeks ago

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@Vibhav Aggarwal I don't think that would be reasonable. If marks for attempt is to be awarded then it should for every question and not just for question 6.

Suchir Kaustav - 6 months, 3 weeks ago

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For p2 I did not use php but some approach that is explicitly not php but just the same thing as that. How much do I expect?

Shubhraneel Pal - 6 months, 4 weeks ago

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If it is mathematically correct, you get full

Maalav Mehta - 6 months, 4 weeks ago

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You don't have experience about change in checking methods

Anubhav Mahapatra - 6 months, 1 week ago

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@Suchir Kaustav @Maalav Mehta Is this the first time this has happened that a question in inmo came wrong? If this did happen before then what was done? Any idea?

Shubhraneel Pal - 6 months, 4 weeks ago

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I remember it happened in 1999 and 2011. But no idea what was done

Maalav Mehta - 6 months, 4 weeks ago

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Reexam is a huge logistical challenge on the part of HBCSE. I think they should increase the number of selections.

Suchir Kaustav - 6 months, 4 weeks ago

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Inmo 2019 cutoff

Akhil Dev - 6 months ago

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Around 48

Maalav Mehta - 6 months ago

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Provisional cutoff ~50...may increase after re-evaluation...btw how many of u guys are expecting increase in ur score..plz post ur current score and expected score

Soutrik Sarangi - 5 months, 4 weeks ago

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where did you find provisional cutoff

Shirish Chinchanikar - 5 months, 3 weeks ago

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@Shirish Chinchanikar Aops

Soutrik Sarangi - 5 months, 3 weeks ago

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@Soutrik Sarangi What should be the merit cut off?

Suchir Kaustav - 5 months, 3 weeks ago

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@Suchir Kaustav 38

Maalav Mehta - 5 months, 3 weeks ago

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What was the cut off then for IMOTC?

Madhur Agrawal - 5 months, 2 weeks ago

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Results declared. The cutoff is most probably 46

Maalav Mehta - 5 months, 2 weeks ago

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Cool cool.

Madhur Agrawal - 5 months, 2 weeks ago

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What about Merit cut off? When will the merit list be declared?

Suchir Kaustav - 5 months, 2 weeks ago

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@Suchir Kaustav In August

Anubhav Mahapatra - 5 months, 2 weeks ago

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I believe that such a place where you can discuss various problems and receive updates to INMO 19 is incredibly useful. I use many services for training, although recently I have focused on the case study writing service https://edubirdie.com/case-study-writing-service since some weaknesses require strong development. Of course, I would like more examples and tasks, but I think that this topic will grow significantly in a few months.

Victoria Dickinson - 4 months, 3 weeks ago

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good comment

Joseph Bush - 3 months, 3 weeks ago

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https://brilliant.org/discussions/thread/inmo-2019-discussion/

Michael Jason - 3 months, 2 weeks ago

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It could be an interesting topic but it looks empty now. I should ask folks at https://forums.operationsports.com/fofc/showthread.php?t=95441 for real discussion. Education and INMO are serious things which are important for every student.

Clayton Simpson - 2 months, 3 weeks ago

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ArtofProblemSolving is much better

Maalav Mehta - 2 months, 3 weeks ago

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How was the inmo?

Aman Pandey - 6 months, 4 weeks ago

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Tougher than ever, the fifth question used something called inversion(according to some AOPSers), which has not ever been asked in INMO. Could you solve P6?

Maalav Mehta - 6 months, 4 weeks ago

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Yeah problem no 6 looked easy but solving it took me complete hour and mind bending brainstorming and I skipped two or three lemmas and messed everything but solved it. Seems they would care to give 2 or 3 marks.

Aman Pandey - 6 months, 4 weeks ago

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@Aman Pandey How did you solve it?

Maalav Mehta - 6 months, 4 weeks ago

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@Maalav Mehta No exotic methods just little brainstorming , some examples, inducing them ,predicting the power rule and then proved.😃

Aman Pandey - 6 months, 4 weeks ago

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@Aman Pandey Bro, the last question is incorrect and in the solution of Allen faculties, they have found a counter example

Maalav Mehta - 6 months, 4 weeks ago

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@Maalav Mehta Yes me too saw today my answer is as not Allen's solution buy I used the continuity of the function too. So seems wrong now.

Aman Pandey - 6 months, 4 weeks ago

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@Aman Pandey The power rule assumed by me was wrong as I thought only about rational numbers didn't seek for irrational ones.

Aman Pandey - 6 months, 4 weeks ago

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If the ans is wrong and the approach is correct or vice versa how much can one expect??

Aryan Arya - 6 months, 4 weeks ago

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If the approach is more than 70 percent correct, you may expect 12 marks. If the answer is correct but obtained by doing some nonsensical stuff, then you may get 2 or 3 marks

Maalav Mehta - 6 months, 4 weeks ago

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If approach is more than 90% correct but you have even one fault then u get a zero

Anubhav Mahapatra - 6 months, 1 week ago

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What's going on? When will results be posted? Final scores are out, that should be no trouble now

Madhur Agrawal - 5 months, 2 weeks ago

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Results will be out on 5 march

Maalav Mehta - 5 months, 2 weeks ago

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F

Madhur Agrawal - 5 months, 2 weeks ago

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Hey what can be expected cutoff this year??

Aryan Arya - 6 months, 4 weeks ago

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RMO coordinator of Gujarat told that according to trend, you are required to solve 3-4 questions

Maalav Mehta - 6 months, 4 weeks ago

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This time I guess cutoff will be around 40

Maalav Mehta - 6 months, 4 weeks ago

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What about cut off for merit certificate?

Suchir Kaustav - 6 months, 4 weeks ago

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@Suchir Kaustav about 25-35

minny bukhariya - 6 months, 3 weeks ago

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