Binomial theorem
= Binomial theorem
{wiki}
For a nonnegative integer $n$,
$$
(x+y)^n=\sum_{k=0}^n\binom nkx^ky^{n-k}.
$$
Combinatorics studies finite and discrete structures through counting, construction, and extremal arguments.
= Binomial theorem
{wiki}
For a nonnegative integer $n$,
$$
(x+y)^n=\sum_{k=0}^n\binom nkx^ky^{n-k}.
$$
Combinatorics studies finite and discrete structures through counting, construction, and extremal arguments.