GWD数学，求这道题的思路，谢谢~

ambertun

Q2:

On Saturday morning, Malachi will begin a camping vacation and he will return home at the end of the first day on which it rains.  If on the first three days of the vacation the probability of rain on each day is 0.2, what is the probability that Malachi will return home at the end of the day on the following Monday?

答案是

   0.128

向各位XDJM们求思路，谢谢啦

   0.128

向各位XDJM们求思路，谢谢啦

Oia

周六出发，即开始假期；

据题意，周六，周日，周一，下雨的概率是0.2

那么周一回来的概率就是，周六周日都不下雨，周一下雨，

0.8*0.8*0.2 = 0.128

ambertun

嗯，很感谢ING，昨天晚上也想明白了哈。