What is Combinatorial Proof ? Why C(n, r) = C(n, n-r) ? : a Combinatorial proof | Part - 1

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What is Combinatorial Proof ? Why C(n, r) = C(n, n-r) ? : a Combinatorial proof | Part - 1

What is Combinatorial Proof ? Why C(n, r) = C(n, n-r) ? : a Combinatorial proof | Part - 1