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by Stuart@KaplanGMAT » Fri Dec 26, 2008 10:30 am
If n is a multiple of 5, and n=ppq, where p and q are primes, then either p or q must be 5.

Q: which of the following MUST be a multiple of 25?

Well, we know that either p or q is a multiple of 5, but:

1) we don't know which one it is; and
2) neither one is itself a multiple of 25, since then it couldn't be prime.

Therefore, the only answer that MUST be a multple of 25 is:

d) ppqq

since either pp or qq is definitely a multiple of 25.

All of the other choices COULD be multiples of 25, but that's not what the question is asking.
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by crazykrans » Fri Dec 26, 2008 1:28 pm
Thank you Stuart.
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by vittalgmat » Fri Dec 26, 2008 6:12 pm
Wow!!! thanks Stuart .

can u lend me ur brain on my DDay ?? :-)
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