Counting Rules

nPx= n ! / ( n- X ) !

Counting Rules點計?

請用中文解釋一下...

Update:

咁我點知個N係成幾多呢﹑

咁個P又係D咩?

1 Answer

Rating
  • Anonymous
    1 decade ago
    Favorite Answer

    P 係排列意思囉

    n 係 total 共幾多數咩

    x 係取幾多數咩

    ! 係階乘

    for e.g

    n for 6, x for 2

    it can be write down as

    6P2 = 6! / ( 6 - 2 )! = 6! / 4! = 6 * 5 * 4! / 4! = 6 * 5 = 30

    P.S 6! = 6 * 5 * 4 * 3 * 2 * 1

    Source(s): 自己
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