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# What is the value of integer n?

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Manager
Joined: 02 Dec 2012
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What is the value of integer n? [#permalink]

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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
[Reveal] Spoiler: OA
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Joined: 02 Sep 2009
Posts: 39626
Re: What is the value of integer n? [#permalink]

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03 Dec 2012, 03:23
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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]

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30 Jun 2014, 14:33
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Re: What is the value of integer n?   [#permalink] 30 Jun 2014, 14:33
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