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Let S = {1,2,...,100}. The number of nonempty subsets T of S such that the, product of numbers in T is even is
The number of ways to select non-empty set out of S = 100C1+100C2+100C3+..........100C100 =Β $$2^{100}$$-1
Similarly,Β the number of ways to select non-empty set from (say) P=Β {1,3,5,7,9,...................99} =Β $$2^{50}$$-1
Hence, the required number of set =Β $$2^{100}$$-1 - ($$2^{50}$$-1) =Β $$2^{50}\left(2^{50}-1\right)$$
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