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# n is positive integer. Is n odd? 1) 3n is odd 2) n+3 is even

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Senior Manager
Joined: 08 Aug 2005
Posts: 251
n is positive integer. Is n odd? 1) 3n is odd 2) n+3 is even [#permalink]

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06 May 2006, 03:47
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

n is positive integer. Is n odd?

1) 3n is odd
2) n+3 is even
Manager
Joined: 13 Dec 2005
Posts: 224
Location: Milwaukee,WI

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06 May 2006, 04:58
D

1 . 3 * n = odd means n is odd because only odd * odd = odd sufficient

2. n + 3 = even means n is odd because odd + odd =even sufficient
SVP
Joined: 30 Mar 2006
Posts: 1728

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26 May 2006, 00:24
D

1) O*O=odd but O*E=even when 3*n=odd hence n is odd
2) O+O=even and O+E = Odd. when 3+n=even therfore n is odd
26 May 2006, 00:24
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# n is positive integer. Is n odd? 1) 3n is odd 2) n+3 is even

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