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NO.140
困难
00:00
本题平均耗时：3分07秒
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正确率：63%
The probability that event A will occur is 0.8, and the probability that event B will occurs is 0.6. If x is the probability that events A and B will both occur, which of the following must be true?
0.0≤x≤0.2
0.2≤x≤0.4
0.2≤x≤0.4
0.6≤x≤0.8
0.8≤x≤1.0
Select one answer choice.
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