Q.

If A={xR:|x2|>1}, B=xR:x23>1, C={xR:|x4|2} and z is the set of all integers, then the number of subsets of the set (A BC)Z is ____________

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answer is 256.

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Detailed Solution

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|x2|>1x2<1 or x2>1x<1 or x>3A(,1)(3,)x23>1x23>1x24>0(x+2)(x2)>0x<2 or x>2B(,2)(2,)|x4|2x42 or x42x2 or x6c(,2][6,)ABC=(,2)[6,)(ABC)1=[2,6)z(ABC)1={2,1,0,1,2,3,4,5}
Number of subsets 28 = 256

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