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Re: Error on Kaplan CAT? [#permalink]
20 Aug 2008, 06:20

Quote:

If x is a prime number, what is x?

(1) x < 15 (2) x is a multiple of 5

I like the approach Durgesh uses for these problems. When the question states "If...", make it where that condition of "if" creates the universe of numbers which we will deal with when we get to the statements.

So, if x is a prime number creates a universe of only prime numbers. And "What is x?" means we're trying to determine if we can narrow the available choice of x down to a single value.

Prime numbers...2, 3, 5, 7, 11, 13, 17, 19, 23. We've gone high enough since we can see from (1) that one condition imposed is x < 15.

so (1), if x < 15, we still have five options, 2, 3, 5, 7, and 11. This doens't narrow the choices down to a single value. INSUFFICIENT.

(2) X is a multiple of 5. We're still dealing with the "universe" of prime numbers. The only multiple of 5 we see in the "universe" is 5. so the answer must be B.

Since one of the statements is sufficient alone, we do not need to consider the statements together. _________________

------------------------------------ J Allen Morris **I'm pretty sure I'm right, but then again, I'm just a guy with his head up his a$$.

"Multiples multiply out from an integer and are therefore greater than or equal to that integer."

Therefore 0 would not be a multiple of 5! Correct me if Im wrong!

That is not true- if that's what the MGMAT guide says, they have it wrong, as a glance at any proper math book will demonstrate. The multiples of 5 are all numbers 5*x, where x is an integer, positive or negative (or zero):

...-10, -5, 0, 5, 10, ...

On the real GMAT, however, questions about divisibility and multiples are almost always restricted to positive integers- they will begin questions by saying 'If x is a positive integer...', so you probably won't need to worry about negative multiples on the test. _________________

GMAT Tutor in Toronto

If you are looking for online GMAT math tutoring, or if you are interested in buying my advanced Quant books and problem sets, please contact me at ianstewartgmat at gmail.com

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Re: Error on Kaplan CAT?
[#permalink]
31 Aug 2008, 07:13

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