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Is n an integer?

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Intern
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Is n an integer? [#permalink]

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New post 15 Nov 2008, 05:35
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

I am confused by the question and explanation of Q146 in Data Sufficiency of OG. Could any smart guy please help?

Q146
Is n an integer?
(1) n^2 is an integer
(2) n^(1/2) is an integer.

I understand that (2) is sufficient. but I also considered that (1) was also sufficent. But the answer is B, only (2) is sufficient.

could any one please provide examples illustrating why (1) is not sufficient?

thank you in advance.

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Re: Is n an integer? [#permalink]

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New post 15 Nov 2008, 05:54
From stmt1:
Lets take a case where n = sqrt(2)
In this case n^2 = 2, which is an integer, but n= sqrt(2) is not a integer.

Hope that help!

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New post 15 Nov 2008, 05:59
Understood. Thank you

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Re: Is n an integer?   [#permalink] 15 Nov 2008, 05:59
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