NEST

Let X = { 1,2,3...9}

A = { 3,5,8,9}

The no of subsets B of X which satisfy the condition A\B = {3,8} are

(A) 0 (B) 1 (C) 2^5 (D) 2^7

2 Answers

B should contain 5,9 and should not contain 3,8

others dont matter..

SO you have to chose between the remianing 5 elements (to be or not to be)

Hence 2⁵

Thanks Sir :)

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