请教GWD3-Q2

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?

A.     0.008

B.     0.128

C.     0.488

D.     0.512

E.      0.640

为何选B?

NO RAIN ON SATURDAY
NO RAIN ON SUNDAY
RAIN ON MONDAY

so probability = .8*.8*.2 = .128

Answer :B

你多乘了一个0.8啊~

他星期六早上出发，星期六米下雨，星期天米下雨，下周一他回来了,也就是说星期一下雨了

所以应该是0.8x0.8x0.2=0.128

多谢，懂了