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

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Manager
Joined: 21 Mar 2006
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I got this from the Manhattan GMAT and I disagree with their [#permalink]  23 Aug 2006, 19:49
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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A.P.

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Senior Manager
Joined: 14 Aug 2006
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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
Manager
Joined: 12 May 2006
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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)
Intern
Joined: 22 Aug 2006
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Manager
Joined: 21 Mar 2006
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B is the answer!!!! I know what i did wrong now...
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A.P.

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