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Combinatorial Proof : part 2 | Why k * C(n, k) = n * C(n-1, k-1) ?
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In this video, we discuss why k * n choose k = n * (n-1) choose (k-1). The combinatorial proof is discussed.
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Combinatorial Proof : part 2 | Why k * C(n, k) = n * C(n-1, k-1) ?
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