见11题0.65+C54 0.640.4
128、 A的发生概率为0.6,129、 B发生的概率为0.5,130、 问A,B都不131、 发生的最大概率?
0.4 请画两个圆分别代表A,B发生的概率,当B包含于A时,即是A,B 都不发生的最大概率。 I=A+B-A3 B+AB AB=1-0.6-0.5+0.63 0.5=0.4
132、 某种动物由出生而133、 活到20岁的概率为0.7,134、 活到25岁的概率为0.56,135、 求现龄为20岁的这种动物活到25岁的概率。
0.56/0.7 PP=P
136、 There are 6 groups in a room. Each group consists of 3 men. How many handshakes will there be if each man only shakes hands with people who are outside his group?
18C2 - 6 = 18X17/2 - 6 = 153 - 18 = 135. I) 18 people shake had with each other or 18C2 II) Then subtract the hand shakes within each group. Six such group with 6 hand shakes each or 6
137、 if you tossed a coin three times, what s the probability that you get the same side all three times.
the probability that you get one side 1/8 plus the probsbility that you get another side 1/8 totaling 1/4.
排列组合练习题 二
各项定义请参照ETS的PP3中的MATH部分的Discrete Probability
1、一只袋中状语5个乒乓球,其中3只白色,2只红色,现从袋中取球两次,每次一只,取出后不足放回。试求:1)两只球都是白色的概率
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