Question: Prove that a set with n elements has n(n 1)/2 subsets containing exactly two elements whenever n is an integer greater than or equal

Prove that a set with n elements has n(n − 1)/2 subsets containing exactly two elements whenever n is an integer greater than or equal to 2.

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This proof will be similar to the proof in Example 10 The basis step is clear since for n 2 t... View full answer

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