MathDiscrete mathCombinatorics

Binomial theorem

Binomial theorem formula

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Select the correct binomial theorem formula for the general binomial $(x+y)^n$ .

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\sum_{k=0}^{n} {n \choose k} x^{n-k}y^k

\sum_{k=0}^{n} {n! \over {k!(n-k)!}} x^{n-k}y^k

\sum_{k=0}^{n} {n \choose k} x^ky^{n-k}

\sum_{k=0}^{n} x^{n-k}y^k

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