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Fungrim entry: 332721

(nk)=n!k!(n−k)!{n \choose k} = \frac{n !}{k ! \left(n - k\right)!}
Assumptions:n∈Z≥0 and⁡ k∈Z≥0n \in \mathbb{Z}_{\ge 0} \,\mathbin{\operatorname{and}}\, k \in \mathbb{Z}_{\ge 0}
TeX:
{n \choose k} = \frac{n !}{k ! \left(n - k\right)!}

n \in \mathbb{Z}_{\ge 0} \,\mathbin{\operatorname{and}}\, k \in \mathbb{Z}_{\ge 0}
Definitions:
Fungrim symbol Notation Short description
Binomial(nk){n \choose k} Binomial coefficient
Factorialn!n ! Factorial
ZZGreaterEqualZ≥n\mathbb{Z}_{\ge n} Integers greater than or equal to n
Source code for this entry:
Entry(ID("332721"),
    Formula(Equal(Binomial(n, k), Div(Factorial(n), Mul(Factorial(k), Factorial(Sub(n, k)))))),
    Variables(n, k),
    Assumptions(And(Element(n, ZZGreaterEqual(0)), Element(k, ZZGreaterEqual(0)))))

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Copyright (C) Fredrik Johansson and contributors. Fungrim is provided under the MIT license. The source code is on GitHub.

2019-06-18 07:49:59.356594 UTC