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Let A = {15,16,17,18,0}, then the number of subsets of A containing 15 and 0 :
We first remove 15 and 0 from A. Then the no. of subsets of A not containing 15 and 0 is 23= 8.Now we add 15 and 0 to each of these subsets.Hence, the no. of subsets of A containing 15 and 0 is 8.ThanksBharat BajajIIT Delhiaskiitians faculty
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