通项 T_{k+1}=C_n^k a^{n-k}b^k；系数与二项式系数别混。
We consider a dice game that played an important role in the historical development of probability. The famous letter…
一颗骰子扔 4 次，扔出 6 就赢——稳赚。两颗骰子扔 24 次，扔出双六就赢——他以为同理，结果稳赔。
