推 kira1116 : 480 @@？ 06/09 08:06
推 anthony797 : 240? 06/09 11:10
大家好，我是經典美語教授GRE計量的徐毓駿老師，
歡迎準備殺G的同學來試試以下這道題目:
Ten chairs are evenly spaced around a round table and numbered
clockwise from 1 through 10. Five married couples are to sit
in the chairs with men and women alternating,and no one is
to sit either next to or directly across from his or her spouse.
How many seating arrangements are possible?
██████ arragements
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