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combinatorics.openverbs.com
Binomial coefficient nCr = n!/(r!(n-r)!), the number of unordered r-subsets of n. Requires r ≤ n and min(r, n-r) ≤ 10000.
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https://combinatorics.openverbs.com/v1/combinations
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combinatoricsfactorialpermutationscombinationsbinomialcombinations ncrcompute combinationsbinomial coefficientncr apichoose r from n
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