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

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n is positive integer. Is n odd? 1) 3n is odd 2) n+3 is even [#permalink] New post 06 May 2006, 03:47
n is positive integer. Is n odd?

1) 3n is odd
2) n+3 is even
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 [#permalink] New post 06 May 2006, 04:58
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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
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 [#permalink] New post 26 May 2006, 00:24
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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
  [#permalink] 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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