Question: Prime Divisors

Comment on Prime Divisors

If it asks for just "how many prime factors?" would it then be the case that the answer is 6? or does "prime factors" imply unique factors?
Thanks!
greenlight-admin's picture

Good question. The word "different" implies "unique."

Hi Brent,
So if the question asked for how many prime factors does 8500 has, is the answer 6 ?
greenlight-admin's picture

I don't think the test-makers would ask that question. It seems too ambiguous to me.

Dear Sir

If a is a repeating decimal and k • a is a terminating decimal, which of the following is a possible value of k?

2
3 correct
4
5

Please help me to solve this problem.

Regards
greenlight-admin's picture

Choose some nice numbers that meet the given conditions.

One repeating decimal that comes to mind is 0.33333... (this repeating decimal is equal to 1/3)

So, let's say a = 0.33333...

If we multiply a by 3, we get 1, which is a terminating decimal.

So, if k = 3, then both conditions are met (a is a repeating decimal and ka is a terminating decimal)

Thank you sir.

Hi Brent! Could you explain this question? https://greprepclub.com/forum/x-2-is-divisible-by-both-40-and-75-if-x-has-exactly-1997.html

Why is E not the right answer?

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