10! / 6!(10-6)!=210
My question is, how was this answer arrived at? I can't find factorials on my TI-84 nor can it seem to handle those numbers anyway.
收錄日期: 2021-04-21 18:07:20
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20130318145005AAu4Av2