If A={1,2,3,4 … . n} and B ⊂ A ; C ⊂ A, then the find number of ways of selecting Unordered pair ...

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If A={1,2,3,4 … . n} and B ⊂ A ; C ⊂ A, then the find number of ways of selecting Unordered pair of B and C such that B ∩ C=ϕ

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