From the 1992 Irish Maths Olympiad:

*Let A be a nonempty set with n elements. Find the number of ways of choosing a pair of subsets (B,C) of A such that B is a nonempty subset of C.*

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From the 1992 Irish Maths Olympiad:

*Let A be a nonempty set with n elements. Find the number of ways of choosing a pair of subsets (B,C) of A such that B is a nonempty subset of C.*

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