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Source: — Data Sufficiency |
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by dikku07 » Thu Aug 13, 2009 12:55 pm
hmmmmm. My reasoning is getting me to choose E as answer. waiting to know the reasoning for correct answer.
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Independentely sufficient

by way2kailash » Thu Aug 13, 2009 2:30 pm
As X is a factor of Y and Y factor of Z, x is a factor of Z

Both statements are by themselves sufficient :

A) XZ is even.
For XZ to be even, X-odd Z- even, X- even Z - odd, X- even Z- even.
As X is a factor of Z, X-even and Z- odd is not possible as anything multiplied by even is even. So in remaining both cases Z is even.
B) Y is even.
As Y is factor of Z and Y is even, Z has to be even, again by same logic that even * (even or odd) = even
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by niraj_a » Thu Aug 13, 2009 3:58 pm
i solved too quick and picked B. darn it!
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