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Even

by gmat740 » Tue Jun 16, 2009 6:15 am
The positive integers x, y and z are such that x is a factor of y and y is a factor of z. Is z even?
1). xz is even
2). y is even


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Source: — Data Sufficiency |
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by ssmiles08 » Tue Jun 16, 2009 7:01 am
An odd integer has all odd factors.

For Z to be odd, both x and y should be odd.

Choice 1 and choice 2 both tell us that one of them is even which debunks the the possibility of z being odd. Z will always be even.

(D)
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