[求助] 組合的教法
王夫婦有兩個男孩,陳夫婦有兩個女孩,張夫婦有一男一女,共12人
。現從這12人中選6人組一排球隊,所選六人中至少一位爸爸,至少
一位是媽媽,至少一位是男孩,至少一位是女孩,則有 種情形
3 3 3 3 8
C ‧C ‧C‧C ‧C 寫出的答案是這樣 ,我不太知道怎麼解釋它是錯的
1 1 1 1 2
他的想法是 從3個爸爸中選一個,3個媽媽中選一個,3個男孩中選一個,
3個女孩中選一個,最後在從剩下的8人中選2個
謝謝!!
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