這邊只要是能夠交換的，就要除2！，譬如說左邊就有三個地方可以交換，右邊則是一個可以交換，所以答案是
7！/(2！2！2！2！)
=5040/16
=315#
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這邊只要是能夠交換的，就要除2！，譬如說左邊就有三個地方可以交換，右邊則是一個可以交換，所以答案是
7！/(2！2！2！2！)
=5040/16
=315#
Users viewing this question
are also looking at these questions 😉
