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Number Properties DS Question

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by sonalibhangay » Wed Apr 17, 2013 9:11 am
If x, y , and z are integers, is x/ yz an integer?

A) y is a factor of x more than once.

B) All of the prime factors of z are also factors of y


I believe the answer should be [spoiler]E but OA is C Source: Princeton[/spoiler]
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by Anju@Gurome » Wed Apr 17, 2013 10:05 am
sonalibhangay wrote:If x, y , and z are integers, is x/ yz an integer?

A) y is a factor of x more than once.
B) All of the prime factors of z are also factors of y
Consider the following two cases,
  • x = 4, y = 2, and z = 2 ---> x/yz is an integer
    x = 4, y = 2, and z = 4 ---> x/yz is not an integer
Both of the above cases satisfy both the statements but the answers are different in each case.

The correct answer is E.

Note : The 2nd statement is ambiguous. If it was supposed to mean that if y has n number of 2s or 3s in it, then z also have same number of 2s or 3s in it... The correct answer will be C. However, if someone simply asks, how many prime factors does 8 have? We say one, not three.
Anju Agarwal
Quant Expert, Gurome

Backup Methods : General guide on plugging, estimation etc.
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by sonalibhangay » Thu Apr 18, 2013 12:32 am
Thanks, that clears my doubt.

Regards, Sonali.
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