不懂就问各位数学家们：这种括号写法的是什么operation
@knight_s n!/((n-r)!r!) https://en.m.wikipedia.org/wiki/Binomial_coefficient
@lilythepooh Thanks, 前两天有收到回复了，还是谢谢~
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@lilythepooh Thanks, 前两天有收到回复了，还是谢谢~