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

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

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New post 07 Oct 2008, 06:26
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

What is the value of the integer n?
(1) n(n + 2) = 15
(2) (n + 2)n = 125

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.

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Re: math--integer value [#permalink]

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New post 07 Oct 2008, 10:14
[quote="albany09"]What is the value of the integer n?
(1) n(n + 2) = 15
(2) (n + 2)n = 125


FROM ONE

15 = 5*3 OR 15*1

ONLY THE COMBINTATION 5,3 FITS IN THE FORM N(N+2) = 3(5).........

or -5, -3 ............inSUFF

FROM 2

I BELKEIVE THE GIVEN IS

(N+2)^N = 125 = 5^3......SUFF

b is the answer thanks for correcting me

Last edited by yezz on 07 Oct 2008, 16:24, edited 1 time in total.

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Re: math--integer value [#permalink]

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New post 07 Oct 2008, 13:16
Hey..

I think Answer is B.

As, (N+2) * N = 125 can not be possible. it should be (N+2) ^ N = 125.

and only one possible value which is 5.

While in case A,

for N = 3, 3 * 5 = 15 it is true and also

for N = -5, -5 * -3 = 15. it is also true so we have not unique answer.

That's why it is B.

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Re: math--integer value [#permalink]

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New post 07 Oct 2008, 13:23
What is the value of the integer n?
(1) n(n + 2) = 15
(2) (n + 2)n = 125

If the ST2 is correct, then it is (E)

(1) n can be 3 or -5
(2)Not sure any integer satisfies this.

As Twoon mentioned, if ST2 is (n+2)^2=125, then n=3 and hence suff (B).
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Re: math--integer value   [#permalink] 07 Oct 2008, 13:23
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What is the value of the integer n? (1) n(n + 2) = 15 (2) (n

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