Binomial
Binomial[n, m] gives the binomial coefficient "n choose m", the number of ways to choose m items from n.
Examples
Binomial coefficients:
Binomial[5, 2]
(* 10 *)
Binomial[10, 5]
(* 252 *)Pascal's triangle row:
Table[Binomial[4, k], {k, 0, 4}]
(* {1, 4, 6, 4, 1} *)Please visit the official Wolfram Language Reference for more details.