来自初志方的问题
将一颗骰子连掷5次,恰好2次出现3点的概率为()A.C52(16)2(56)3B.C52(16)3(56)2C.(56)3(16)2D.C53(16)3(56)2
将一颗骰子连掷5次,恰好2次出现3点的概率为()
A.C52(16)2(56)3
B.C52(16)3(56)2
C.(56)3(16)2
D.C53(16)3(56)2
1回答
2020-11-19 02:35