OG 11 DS problem

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pavithra: Junior | Next Rank: 30 Posts; Posts: 24; Joined: Thu Jan 18, 2007 10:03 pm

by pavithra » Wed Mar 14, 2007 1:21 pm

This problem is in the DS section (QN. no.146) of OG11.

Is n an integer?

1) n^2 is an integer
2) sq. rt of n is an integer

The answer given is B.

If n^2 is an integer, n should also be an integer , right??? Shouldn't the answer be D.

Someone please explain.

Thanks
Pavithra

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Source: Beat The GMAT — Data Sufficiency | Wed Mar 14, 2007 1:21 pm

rajesh_ctm: Master | Next Rank: 500 Posts; Posts: 135; Joined: Tue Feb 27, 2007 7:21 pm; Thanked: 2 times

by rajesh_ctm » Wed Mar 14, 2007 5:40 pm

If n^2 is an integer, n should also be an integer , right???

Not necessary. Fitting in numbers is the easiest method to verify. Root of 2 is not an integer. But its square, i.e. 2 is an integer.

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pavithra: Junior | Next Rank: 30 Posts; Posts: 24; Joined: Thu Jan 18, 2007 10:03 pm

by pavithra » Wed Mar 14, 2007 7:13 pm

Right I get it now...Thanks

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