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

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Senior Manager
Joined: 25 Dec 2003
Posts: 359
Location: India
What is the value of the integer n? (1) n(n+2)=15 (2) [#permalink]

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25 Jun 2004, 01:56
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What is the value of the integer n?
(1) n(n+2)=15
(2) (n+2)^n=125

I feel the answer is B. But a frnd of mine who took the test, says it is C.

Can anyone correct me/him, by solving the above.

Thanks.
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Manager
Joined: 07 May 2004
Posts: 183
Location: Ukraine, Russia(part-time)

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25 Jun 2004, 02:32
carsen wrote:
What is the value of the integer n?
(1) n(n+2)=15
(2) (n+2)^n=125

I feel the answer is B. But a frnd of mine who took the test, says it is C.

Can anyone correct me/him, by solving the above.

Thanks.

1 is not suff. n = 3 or n = -5,

2 is sufficient: n = 3(because n >= 0, otherwise |(n+2)^n| < 1 and if n >=0, (n+2)^n is strictly monotoneous and increasing function of n and there is only 1 n, such that (n+2)^n = 125).
Manager
Joined: 07 May 2004
Posts: 183
Location: Ukraine, Russia(part-time)

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25 Jun 2004, 02:33
carsen wrote:
What is the value of the integer n?
(1) n(n+2)=15
(2) (n+2)^n=125

I feel the answer is B. But a frnd of mine who took the test, says it is C.

Can anyone correct me/him, by solving the above.

Thanks.

Where did you find it? What's the probability of encountering such question on actual GMAT? I've not seen such questions on my GMAT...
Manager
Joined: 08 Jun 2004
Posts: 245
Location: INDIA

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25 Jun 2004, 10:57
HI

A= not sufficient...

B = the oply number that agrees to the given Equation and gives the na s as = 125 is three(3)...

any other number would not satisfy the above condition... I guess this sort of probs have to solevd by inserting the numbers themselves.

hope that helps!

Have fun
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25 Jun 2004, 10:57
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