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shreyas
 Post subject: Factors, powers, and integers
PostPosted: Tue Jun 15, 2010 9:48 am 
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Is 2^a + 2^b + 2^c divisible by 2?
(1) a + b + c = 6
(2) a, b, and c are distinct positive integers
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gmat770
 Post subject: Re: Factors, powers, and integers
PostPosted: Wed Jun 30, 2010 11:06 am 
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Choice B
Statement 2 alone is sufficient.

a, b and c are distint positive integers. So, 2^a, 2^b and 2^c will all be divisible by 2. Their sum will also be divisible by 2.

Cannot conclude from statement 1. Whatif a = 0.5, b = 4.5 and c = 1?
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