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【概率论中C(8,3)除以C(10,3)怎么算】
概率论中C(8,3)除以C(10,3)怎么算
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2019-11-20 08:39
【概率论中C(8,3)除以C(10,3)怎么算】
概率论中C(8,3)除以C(10,3)怎么算
C(m,n)=m!/[(m-n)!n!]
C(8,3)=8!/(5!3!)
C(10,3)=10!/(7!3!)
C(8,3)/C(10,3)=[8!/(5!3!)]/[10!/(7!3!)]=(8!7!3!)/(10!5!3!)=(7×6)/(10×9)=7/15