1st/2 ways: Show Σ k * nCk = n * 2^(n-1) where k=1:n by si118yt118si

steem · @si118yt118si · Apr 6 '20 (edited)

$0.03

1st/2 ways: Show Σ k * nCk = n * 2^(n-1) where k=1:n

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