# Prove that ∑k*C(n, k) = n2^(n - 1)?

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Prove that ∑ k*C(n, k) = n2^(n - 1)

.............k = 1

NB:

C(x, y) = x!/[y!(x - y)!]

Prove that ∑ k*C(n, k) = n2^(n - 1)

.............k = 1

NB:

C(x, y) = x!/[y!(x - y)!]

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