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Source: — Data Sufficiency |
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by Frankenstein » Mon May 23, 2011 3:03 am
Hi,

From(1) k^2=4 => k=-2 or +2
n+(1/n) = -2 or +2
n+1/n = -2 =>(n+1)^2/n = 0 => n = -1
n+1/n = 2 =>(n-1)^2/n = 0 => n = 1
So, n = -1 or +1
2 values of n satisfy
Sufficient

From(2) k=2 =>n+(1/n) = 2n =>n= 1/n
S0, n=-1 or +1
Sufficient

Hence answer D

Cheers!
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