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- - math (http://archives2.twoplustwo.com/showthread.php?t=302398)

TEKEE

07-28-2005 08:32 AM

math

How does C(48,3)=17,296 & C(47,2)=1,081, work math out please thanks.

jason_t

07-28-2005 08:36 AM

Re: math

[ QUOTE ]
How does C(48,3)=17,296 & C(47,2)=1,081, work math out please thanks.

[/ QUOTE ]

C(48,3) = (48 * 47 * 46)/(3 * 2) and C(47,2) = (47 * 46)/2.

LetYouDown

07-28-2005 09:04 AM

Re: math

More generally:

C(n,r) = n!/[(n-r)! * r!]

elitegimp

07-28-2005 11:27 AM

Re: math

[ QUOTE ]
More generally:

C(n,r) = n!/[(n-r)! * r!]

[/ QUOTE ]

and n! = n*(n-1)*(n-2)*...*2*1

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