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What is the value of the positive integer n? (1) n4 < 25

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What is the value of the positive integer n? (1) n4 < 25 [#permalink] New post 11 Aug 2007, 21:07
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15. What is the value of the positive integer n?
(1) n4 < 25
(2) n ≠ n2

y is oa C here
Manager
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 [#permalink] New post 11 Aug 2007, 22:14
Stmt 1: INSUFFICIENT as n can be 1 or 2; as 1^4
Stmt 2: INSUFFICIENT as it does not tell us anything about n just that n is not n^2
Stmt 1 and Stmt 2 together concludes for us that n is 2 therefore C
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Re: DS Section 8 Q 15 [#permalink] New post 11 Aug 2007, 22:22
crazy123 wrote:
15. What is the value of the positive integer n?
(1) n4 < 25
(2) n ≠ n2

y is oa C here


(1) first find what possible values of n^4 would fall less than 25
1^4 = 1
2^4 = 16
3^4 = 81
So n can be 1 or 2, insufficient

(2) still doesn't tell us much other than n is not equal to its square, insufficient

if we put (1) and (2) together, we can know that n cannot be 1, so n can only be 2. SUFFICIENT
Re: DS Section 8 Q 15   [#permalink] 11 Aug 2007, 22:22
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What is the value of the positive integer n? (1) n4 < 25

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