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if X is a postive integer, is X divisble by 2? (1) X^3 + X

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Manager
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if X is a postive integer, is X divisble by 2? (1) X^3 + X [#permalink] New post 10 Sep 2007, 09:56
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A
B
C
D
E

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if X is a postive integer, is X divisble by 2?

(1) X^3 + X is divisible by 2
(2) 5X + 4 is divisble by 6
Senior Manager
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 [#permalink] New post 10 Sep 2007, 10:06
1) X^3+X= X(X^2 + 1) is insufficient since X could be odd and even number

2) 5X+4 this is suffcient since x is here 4, 10, 16, 22 and so on which all of them even

Ans: B
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 [#permalink] New post 10 Sep 2007, 10:11
Should be 'B'.
Stmt1: x^3 + x is divisible by 2 for even and odd x. So NOT SUFF

Stmt2: 5x+4 is divisible by 6. This means that 5x+4 is even. This is possible when x is even. So SUFF
  [#permalink] 10 Sep 2007, 10:11
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if X is a postive integer, is X divisble by 2? (1) X^3 + X

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