Comes from binomial theorem I suppose. (x+y)^n = \sum_{k=0}^n [C(n,k) x^k y^(n-k)]. Setting x = y = 1 gives the result.
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My brain only sees compiled LaTeX these days
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The cardinality of the power set is the sum of the cardinalities of all possible sunsets.
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I love this typo.
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Basically 2ⁿ = (1+1)ⁿ
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Another use of the binomial theorem is the sum of alternating binomial coefficients is zero. And in general:pic.twitter.com/WSgBzkx4JS
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