有一個箱子
裡面有3紅球.4黃球.5綠球
今天一次從箱子理拿出3個球
每種顏色都拿到的機率是多少
下列哪個正確 請提供過程
(A) 3/12 x 4/11 x 5/10 + 3/12 x 5/11 x 4/10 + ... + 5/12 x 4/11 x 3/10 = 3/11
(B) (3x4x5) / C(12,3) = 3/11
(C) 以上皆非 且機率>3/11
(D) 以上皆非 且機率<3/11
(E) 以上皆非 且機率=3/11
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