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本題由lindy提供
A certain basket contains 10 apples, 7 of which are
(A) 7/40
(B) 7/20
(C) 49/100
(D) 21/40
(E) 7/40
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答案：
D
7個紅蘋?
其中要求2紅1綠。那么就是從7個紅里取2個的概率乘以3個綠里取1個概率，即C7 2 乘以C 3 1等于63種取法。
63/120=21/41
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