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What is the value of integer n?

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What is the value of integer n? [#permalink] New post 03 Dec 2012, 03:22
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What is the value of integer n?

(1) n(n+1) =6
(2) 2^(2n) = 16
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Re: What is the value of integer n? [#permalink] New post 03 Dec 2012, 03:23
What is the value of integer n?

(1) n(n+1) =6 --> n^2+n-6=0 --> (n+3)(n-2)=0 --> n=-3 or n=2. Not sufficient.
(2) 2^(2n) = 16 --> 2^{2n}=2^4 --> 2n=4 --> n=2. Sufficient.

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Re: What is the value of integer n?   [#permalink] 03 Dec 2012, 03:23
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