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OG 11 DS problem


 
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pavithra
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PostPosted: Wed Mar 14, 2007 2:21 pm    Post subject: OG 11 DS problem Reply with quote
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.

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Pavithra
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rajesh_ctm
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PostPosted: Wed Mar 14, 2007 6:40 pm    Post subject: Reply with quote
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
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PostPosted: Wed Mar 14, 2007 8:13 pm    Post subject: Reply with quote
Right I get it now...Thanks
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