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Kaplan: Prime numbers, multiples etc

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Re: Kaplan: Prime numbers, multiples etc

by Stuart@KaplanGMAT » Sun May 11, 2008 8:33 pm
netigen wrote:I came across the following question on Kaplan test, help me find the right answer

If X is a prime number, what is the value of X?

(1) X < 15
(2) (X-2) is a multiple of 5
(1) x could be 2, 3, ...: insufficient.

(2) x could be 2, 7 ...: insufficient

Together:

x = 2 or 7 (2-2 = 0, which is a multiple of all numbers; 7-2=5, which is a multiple of 5).

Even combined, we can get more than one answer: choose (e).
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by netigen » Sun May 11, 2008 8:52 pm
So it means we need to consider 0 to be a multiple of all numbers in GMAT
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by Stuart@KaplanGMAT » Sun May 11, 2008 9:27 pm
netigen wrote:So it means we need to consider 0 to be a multiple of all numbers in GMAT
Correct.

0 is a multiple of every number and a factor of no number.

If a question specifically says "positive multiple", then you can ignore 0.
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