Binomial expansion
= Binomial expansion
The binomial expansion expresses $(a+b)^n$ as $\sum_{k=0}^n\binom nk a^{n-k}b^k$ for a nonnegative integer $n$. The <binomial coefficients> give the number of ways to choose which $k$ factors supply $b$.
= Binomial expansion
The binomial expansion expresses $(a+b)^n$ as $\sum_{k=0}^n\binom nk a^{n-k}b^k$ for a nonnegative integer $n$. The <binomial coefficients> give the number of ways to choose which $k$ factors supply $b$.