数学概率

"one at a time without being replaced" 这是有放回的抽取还是不放回的抽取？

金牌会员

Rank: 6 Rank: 6

精华: 0
积分: 1650
经验: 1650 点
威望: 164 点
金钱: 164 ￥
魅力: 164

2^#

haoye12321发表于 2011-8-16 20:21 | 只看该作者

LZ给个情境吧···这但单一句话的···让人怎么理解···

TOP

金牌会员

Rank: 6 Rank: 6

精华: 0
积分: 1330
经验: 1330 点
威望: 132 点
金钱: 132 ￥
魅力: 132

3^#

adolfgao发表于 2011-8-17 06:39 | 只看该作者

A jar contains 16 marbles, of which 4 are red, 3 are blue, and the rest are yellow.If 2 marbles are to be selected at random from the jar, one at a time without being replaced, what is the probability that the first marble selected will be red and the second marble selected will be blue?

TOP