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03 Dec 2012, 03:22
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B
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Difficulty:
15%
(low)
Question Stats:
78% (00:59) correct
22%
(00:53)
wrong
based on 1837
sessions
History
Date
Time
Result
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What is the value of integer n?
(1) n(n+1) =6
(2) 2^(2n) = 16
(1) n(n+1) =6
(2) 2^(2n) = 16
03 Dec 2012, 03:23
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Bookmarks
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.
Answer: B.
(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.
Answer: B.
What is the value of integer n?
(1) n(n+1) =6
n & (n+1) means is TWO Consecutive integers.
Therefore, either 6 = 2 * 3 or 6 = -2 * -3 (do not forget negative values)
n =2 or -3
Insufficient
(2) 2^(2n) = 16
2^(2n) = 4 ^n = 16 = 4^2.......n =2
Sufficient
Answer: B
(1) n(n+1) =6
n & (n+1) means is TWO Consecutive integers.
Therefore, either 6 = 2 * 3 or 6 = -2 * -3 (do not forget negative values)
n =2 or -3
Insufficient
(2) 2^(2n) = 16
2^(2n) = 4 ^n = 16 = 4^2.......n =2
Sufficient
Answer: B
