Evaluate 11P4 and 9C3 .?
回答 (2)
2015-12-01 11:21 pm
11 P 4 = 11!/(11-4)!
= 11!/7!
= 8*9*10*11
= 88*90
= 7920
9 C 3 = 9!/3!(9-3)!
= 9!/3!6!
= 7*8*9/3!
= 7*8*9/2*3
= 7*4*3
= 7*12
= 84
= 11!/7!
= 8*9*10*11
= 88*90
= 7920
9 C 3 = 9!/3!(9-3)!
= 9!/3!6!
= 7*8*9/3!
= 7*8*9/2*3
= 7*4*3
= 7*12
= 84
2015-12-01 11:19 pm
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7920
84
7920
84
收錄日期: 2021-04-30 20:20:33
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https://hk.answers.yahoo.com/question/index?qid=20151201145615AAGOaV9