[問題] 有關機率的問題..
自修時寫的題目 可是他只有答案我真的不知道我錯在哪ˊˋ
Two events are complementary when
A. the sum of their probabilities equal one.
B. the joint probability of the two events is one.
C. they are both independent and mutually exclusive.
D. None of the above
請教各位板大
為什答案不是A
而是D啊?
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