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# What is the value of the integer n? (1) n(n+2)=15 (2)

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Manager
Joined: 06 Feb 2010
Posts: 175
Concentration: Marketing, Leadership
Schools: University of Dhaka - Class of 2010
GMAT 1: Q0 V0
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WE: Business Development (Consumer Products)
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Kudos [?]: 455 [0], given: 182

What is the value of the integer n? (1) n(n+2)=15 (2) [#permalink]  24 Oct 2010, 23:25
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35% (medium)

Question Stats:

67% (01:31) correct 32% (01:16) wrong based on 31 sessions
What is the value of the integer n?
(1) n(n+2)=15
(2) (n+2)^n =125

Answer is B.
But I don’t know how to finish it…
(n+2)^n=5^3
How it is n=3, here base n=2 and 5 is not same..
[Reveal] Spoiler: OA

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Re: Value of an integer [#permalink]  24 Oct 2010, 23:34
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the first statement n(n+2)=15 would give two integer values as -3 and 5; not conclusive

The second statement (n+2)^n =125 can be written as

(n+2)^n = 5^3
=(3+2)^3 =5^3 --replacing n with 3
LHS =RHS

n =3, conclusive
Re: Value of an integer   [#permalink] 24 Oct 2010, 23:34
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# What is the value of the integer n? (1) n(n+2)=15 (2)

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