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Is n an integer? S1. n/3 is an integer S2. 2n is an integer

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Is n an integer? S1. n/3 is an integer S2. 2n is an integer [#permalink] New post 22 Jun 2010, 15:16
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A
B
C
D
E

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(N/A)

Question Stats:

82% (01:12) correct 18% (00:11) wrong based on 22 sessions
Is n an integer?
S1. n/3 is an integer
S2. 2n is an integer
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Kudos [?]: 28765 [0], given: 2846

Re: n/3 is an integer... [#permalink] New post 22 Jun 2010, 20:35
Expert's post
Is n an integer?

(1) For \frac{n}{3} to be an integer n must be an integer --> \frac{n}{3}=integer --> n=3*integer=integer. Sufficient.

(2) 2n is an integer --> n may or may not be an integer, for instance n=0.5 or n=1. Not sufficient.

Answer: A.
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Re: n/3 is an integer... [#permalink] New post 24 Jun 2010, 01:53
Yes....A it should be
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Re: n/3 is an integer...   [#permalink] 24 Jun 2010, 01:53
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Is n an integer? S1. n/3 is an integer S2. 2n is an integer

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