Waste less time on Facebook — follow Brilliant.
Already have an account? Log in here.
Arithmetic Progressions
What's the sum of the first 100 positive integers? How about the first 1000? Learn the fun and fast way to solve problems like this. See more
\(a_1,a_2,a_3,\ldots, a_{98} \) are terms in an arithmetic progression with common difference 1 such that their sum is 137.
What is the sum of the even terms of this progression? That is, what is the value of \( a_2+a_4+a_6+\cdots+a_{98} \)?
Already have an account? Log in here.
by
Sandeep Bhardwaj
1000 chocolates are placed on a table. On their covers, they are labelled \(1,2,3,4, \cdots ,1000\). Two friends Sandeep and Abhiram eat chocolates labelled in the arithmetic progressions \(3,6,9,12,15,\cdots\) and \(7,14,21,28,35,\cdots\) respectively. If ever there is any conflict between them i.e. if both are entitled to eat the same chocolate, Sandeep eats it. So, what is the total number of chocolates which are not eaten?
Already have an account? Log in here.
by
Ashish Siva
What is the largest positive integer that must be a divisor of the sum of an arithmetic sequence with 90 integer terms?
Try Part II
Already have an account? Log in here.
by
Aaron Tsai
The interior angles of a convex polygon are in an arithmetic progression. If the smallest angle is \( 100^{\circ}\)and common difference is \(4^{\circ}\), then find the number of sides.
Already have an account? Log in here.
by
mukesh malav
\[\large \frac ab \ , \ ab \ , \ a -b \ , \ a+b \]
Above shows real numbers that belong to an arithmetic progression in order. Find the next term of this sequence.
Already have an account? Log in here.
by
Gerardo Hernandez