“I never teach my pupils; I only attempt to provide the conditions in which they can learn.” ~ ALBERT EINSTEIN
选人题型。
从30位男士及40位女士任选5位，求以下概率：
a. 5人性别相同
b. 5人中有2男3女
c. 5人中至少有2位是男士
d. 5人中一定要包括某两位女士
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