—May I come in?
—________ [ ]
A. Come in, please.
B. It doesn't matter.
C. That's OK.
答案:A
盒中有大小形状相同的5只白球,2只黑球,用随机模拟法求下列事件的概率:
(1)任取1只球,得到白球;
(2)任取3只球,恰有2只白球;
(3)任取3只球(分三次每次放回再取),恰有3只白球。
宣传