Problem Solving

试题详情

题目:

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?

选项:

A、0.008
B、0.128
C、0.488
D、0.512
E、0.640

答案:

B

提问:

请问一下小梅老师,这道题跟那道开车听音乐(ABC电台如果A没有想听的就换到B)有什么区别呀?为什么本题三天的概率相乘然后那道题是相加呢?
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提问:

遇到排列组合类的题就不太会。。。
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提问:

此题题意没能理解 错选了A, 由于认为the following Monday, 就是前1-3天中的第三天
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