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31-01-2024
Mathematics

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S is a set containing n elements.A subset A of S is selected.The set S is reconstructed by replacing the elements of A.A subset B of S is now selected.If the number of ways of selecting subsets A and B of S such that A∩B=ϕ is 81,then n=

A. 3
B. 4
C. 5
D. none of these

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