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# Distinct and Positive - what are they?

I have encountered the question "What is the sum of all the (distinct, positive) prime factors of 99?" but I have no idea what "prime factors", "distinct" and "positive" are. Its not that I'm terrible at maths, its just that I've done most of my math problems in Polish. Help me please!

Note by Pola Forest
3 years, 11 months ago

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Hi. Distinct means different. You can't repeat the same number. Distinct = 1,2,3,10,14 Not distinct = 1,1,2,3,10,10,14 Prime numbers are 2,3,5,7,11.... Factors are things that the number is divisible by. Factors of 24=1,2,3,4,6,8,12,24 Prime factors of 24 are 2,3 Positive means above zero. 1, 5 and 10 are positive but -3, -2 and -59 are not/

- 3 years, 11 months ago

Thanks - but I'm not sure I understood the thing with distinct and positive.

- 3 years, 11 months ago

Positive numbers are bigger/larger than zero. That means 1,2,3,4... Negative numbers are smaller than zero. That means -1,-2,-3,-4...

Distinct numbers are different from each other. 1,2 and 3 are different but in 1, 1, 2, 3 are not different. 1 is there two times

- 3 years, 11 months ago

In this problem, "distinct" means just that they want you to add each factor only once.

- 3 years, 11 months ago

Okay, I understand, thank you!

- 3 years, 7 months ago

Distinct numbers are a set of numbers where they are all different. e.g. {1,2,4,5,8,6,3,9} Prime numbers are numbers which can only be divided by 1 and the number itself. Composite numbers are the opposite of primes, meaning that they can divided by other numbers. e.g. {2,3,97,11,17,67} are prime and {4,6,8,9,96,85}. 1 is not prime or composite. Positive numbers are numbers bigger than zero. e.g. {1,2,5,6,34,64,543} Hope it helps.

- 3 years, 11 months ago

If $$x$$ is positive, then $$0<x$$.

If $$y$$ and $$z$$ are distinct, then $$y\not= z$$.

- 3 years, 11 months ago