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Square and Root

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Source: — Data Sufficiency |
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by Frankenstein » Thu Jun 09, 2011 5:24 am
Hi,
From(1): if n^2 = 4, n is integer
if n^2 = 5, n is not an integer
Insufficient

From(2): sqrt(n) is integer. So n is square of an integer which is always integer
Sufficient

Hence, B
Cheers!

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by cans » Thu Jun 09, 2011 5:42 am
a) n^2 is integer.
n=4,root(2) insufficient
b)root(n) is integer
n is integer
Sufficient
IMO B
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