so?
by ✨杨柳白皮✨ @ 2020-09-19 21:49:16
nhml qwq
by Remake_ @ 2020-09-19 21:49:19
无聊
by 听取MLE声一片 @ 2020-09-19 21:52:07
无趣
by Retired_lvmao @ 2020-09-19 21:55:19
所以呢？
by _tommysun_ @ 2020-09-19 21:55:38
sqlm
by Devil_may_cry @ 2020-09-19 22:02:31
sqlm
by 是个妹子啦 @ 2020-09-23 19:02:13
@[Madlife7](/user/365643) sqlm
by zjyqwq @ 2020-12-28 19:36:24
就没有人像我一样~~闲得慌~~算算概率吗？
$C_{10}^5\times\left(\frac{1}{3}\right)^5\times\left(\frac{2}{3}\right)^5=252\times\frac{1}{243}\times\frac{32}{243}\approx13.66\%$
我只是个初一蒟蒻，算错了请轻喷。
by cancan123456 @ 2021-08-18 19:28:07
无用
by LeiZeProMax @ 2022-08-25 15:13:19