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Let the set A={a, b, c, d, e} and P and...

Let the set `A={a, b, c, d, e} and P and Q` are two subsets of A. The number ofways inwhich `P and Q` can be selected so that `PnnQ` has at least one common element.is `a^b-c^b` where `a, b, c` are coprime then find `(a+c-b)`

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