binomal( n , k )
The binomial coefficient in SageMath. Defined for integer arguments by
\[ \binom{ n }{ k } = \frac{ n! }{ (n-k)! \: k! }\]and for one noninteger argument by
\[ \binom{ x }{ k } = \frac{ x(x-1) \cdots (x-k+1) }{ k! }\]Examples:
Related functions: gamma
Function category: gamma functions sagemath-docs