STATISTICS HELP!!?
回答 (3)
2016-03-14 2:15 am
definition of nCr is
nCr = n! / [r!(n-r)!]
nCr = n! / [r!(n-r)!]
2016-03-14 2:21 am
Prove that C(n,r) = C(n,n-r).
C(n,r) = n!/[(n-r)!r!] = n!/[r!(n-r)!]
= C(n,n-r)!]
Note that n-(n-r)=r.
C(n,r) = n!/[(n-r)!r!] = n!/[r!(n-r)!]
= C(n,n-r)!]
Note that n-(n-r)=r.
2016-03-14 2:15 am
Yes, that's true.
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收錄日期: 2021-05-01 20:30:51
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