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DS INTEGER

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DS INTEGER

by [email protected] » Sat Sep 17, 2011 12:34 pm
For all values of the integer x, is the product (x + 3)(x2 + 3x + 2) divisible by 4?

1) is an odd integer
2) x is divisible by 16


MY ANS D IS WRONG[spoiler][/spoiler]
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by cans » Sat Sep 17, 2011 9:01 pm
(x + 3)(x2 + 3x + 2) = (x+1)(x+2)(x+3)
A) x is odd. thus (x+1),(x+3) are consecutive even integers. thus divisible by 4
Sufficient
B) x=16n. Not divisible by 4. Sufficient
IMO D
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