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Is n an integer?

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Is n an integer?  [#permalink]

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New post 12 Apr 2017, 21:08
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A
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Question Stats:

70% (00:55) correct 30% (01:17) wrong based on 95 sessions

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Is \(n\) an integer?

(1) \(3n^2\) is an integer.

(2) \(\frac{\sqrt{n}}{3}\) is an integer.

Source: GMAT Free

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Re: Is n an integer?  [#permalink]

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New post 12 Apr 2017, 23:02
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Is \(n\) an integer?

(1) \(3n^2\) is an integer --> if n = 2, then the answer is YES but if \(n = \sqrt{2}\), the answer is NO. Not sufficient.

(2) \(\frac{\sqrt{n}}{3}\) is an integer --> \(\frac{\sqrt{n}}{3}=integer\) --> \(\sqrt{n}=3*integer\) --> \(n = 9*integer^2=integer\). Sufficient.

Answer: B.
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Re: Is n an integer?  [#permalink]

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Is n an integer? (1) 3n^2 is an integer  [#permalink]

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New post 26 May 2017, 08:34
Is n an integer?

(1) 3n^2 is an integer.
(2) √n/3 is an integer.
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Re: Is n an integer?  [#permalink]

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Re: Is n an integer?  [#permalink]

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New post 26 May 2017, 09:40
nguyendinhtuong wrote:
Is \(n\) an integer?

(1) \(3n^2\) is an integer.

(2) \(\frac{\sqrt{n}}{3}\) is an integer.

Source: GMAT Free



B

As you can negate a by taking n=1/(root3)
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Re: Is n an integer?  [#permalink]

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New post 20 Sep 2018, 05:56
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Re: Is n an integer? &nbs [#permalink] 20 Sep 2018, 05:56
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