Karthik200 wrote:

x=?

1. \(x^{4x}=1\)

2. \(x^{-x}=-1\)

S1 - \(x^{4x}=1\)

can be possible if x=0, 1 or -1.

Plugging in these values will give result 1.

Insufficient.

S2 - \(x^{-x}=-1\)

This statement rules out the possibilities of 0,1.

Hence x=-1. Sufficient.

Ans. B

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