If you, don't a positive integer the binomial theorem, Newton's binomial theorem will give you an infinite sum.
如果你不知道二项式定理中的正整数,牛顿二项式定理将给出一个无穷和。
可汗学院:统计学(视频版)
And we showed in the calculus playlist that an integral actually is this infinite sum of infinitely small things, but I don't want to digress too much.
In mathematics, a series is, informally speaking, the sum of the terms of an infinite sequence. The sum of a finite sequence has defined first and last terms, whereas a series continues indefinitely.
Given an infinite sequence (a1, a2, a3, ...), a series is informally the result of adding all those terms together: a1 + a2 + a3 + ···. These can be written more compactly using the summation symbol ∑.