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I got this from the Manhattan GMAT and I disagree with their

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I got this from the Manhattan GMAT and I disagree with their [#permalink] New post 23 Aug 2006, 20:49
I got this from the Manhattan GMAT and I disagree with their answer a little please let me know what you gusy think the answer is and I will post the answer once I get a couple replies.

If x is an integer, is x^3 even?

(1) 2x + 2 is even

(2) 3x + 1 is even
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 [#permalink] New post 23 Aug 2006, 20:56
x^3 is even when x is even

1. 2x + 2 is even for both odd and even -INSUFF
2. 3x +1 is even for odd, so x is odd SUFF

Ans: B
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 [#permalink] New post 23 Aug 2006, 21:23
The answer is B.

1.) Insuff

2x+2: the '2x' term will be even regardless if x is is even or odd.

2.) Suff

Whether the term '3x' will be even or odd relies on x. Because we are told that the equation is even, we know x must be odd (Odd + Odd= even)
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 [#permalink] New post 23 Aug 2006, 22:13
Correct Answer is B.
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Answer [#permalink] New post 24 Aug 2006, 09:07
B is the answer!!!! I know what i did wrong now...
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Answer   [#permalink] 24 Aug 2006, 09:07
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