[問題] 一題排列組合
自己在算的時候是分情況下去算
但是這樣算太花時間
詳解是用相同物排列算
答案是8!/4! x 2! x 2!
8!/4! 這裡看不太懂
解答說是把父母子女當相同物
不知道有沒有人能幫忙解釋一下
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