probability?

👨🏻‍🏫 學術台數學

[匿名]

2015-11-07 12:57 pm

two neighbouring families contain 3 children and 2 children respectively.Find the probability that there will be exactly 3 boys in the two families.

回答 (1)

洋yang

2015-11-07 1:36 pm

(1/2)^5 x C3取2 x C2取2

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