[理工] 104成大離散兩題
請問各位正取生大神高手，這題是要怎麼算呢?
圖中第8題及第10題
http://i.imgur.com/hqVHdLe.jpg
第10題的a我算是9!-4!
不知道有沒有錯，懇求大神開釋，感謝感謝!!
祝各位考試順利，備取都備上
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