这是一道GRE数学概率题,题我读懂了,
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这是一道GRE数学概率题,题我读懂了,
For a certain probability experiment,the probability that event A will occur is 1/2 and the probability that event B will occur is 1/3 Which of the following values could be the probability that the event A ∪ B (that is,the event A or B,or both) will occur?Indicate all such values.A.1/3 B.1/2 C.3/4
For a certain probability experiment,the probability that event A will occur is 1/2 and the probability that event B will occur is 1/3 Which of the following values could be the probability that the event A ∪ B (that is,the event A or B,or both) will occur?Indicate all such values.A.1/3 B.1/2 C.3/4
![这是一道GRE数学概率题,题我读懂了,](/uploads/image/z/17668597-13-7.jpg?t=%E8%BF%99%E6%98%AF%E4%B8%80%E9%81%93GRE%E6%95%B0%E5%AD%A6%E6%A6%82%E7%8E%87%E9%A2%98%2C%E9%A2%98%E6%88%91%E8%AF%BB%E6%87%82%E4%BA%86%2C)
由题意分三种情况:
1 A发生,B不发生 P=1/2×2/3=1/3
2.A不发生,B发生 P=1/2×1/3=1/6
3.A、B都发生 P=1/2×1/3=1/6
可见所以可能情况为1/3、1/6.
所以选A.
再问: 我也觉得是A,可是答案是BC,完全理解不了啊
1 A发生,B不发生 P=1/2×2/3=1/3
2.A不发生,B发生 P=1/2×1/3=1/6
3.A、B都发生 P=1/2×1/3=1/6
可见所以可能情况为1/3、1/6.
所以选A.
再问: 我也觉得是A,可是答案是BC,完全理解不了啊