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Source: — Problem Solving |
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by liferocks » Wed Jun 02, 2010 6:35 am
From 1
X^*=X or x(x-1)=x
or x^2 -2x=0
or x(x-2)=0

so x can be either 0 or 2..not sufficient

From 2
(X-1)^*=X-2
or (x-1)(x-2)=x-2
or (x-2)^2=0 so x=2..sufficient

Ans option B

please post DS question under DS sub-forum.
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