39by unordered they mean that they don't distinguish between (A,B) and (B,A)
let S={1,2,3,.......,100}
the number of unordered pairs (A,B)of subsets of S such that A and B have no ekements in common , where A or B both may be φ(null set) is ?
answer : \frac{3^{100} + 1}{2}
the no.of order pair is 3100
but wats unordered pairs ?
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