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#1
12-20-2005, 08:16 PM
 Beavis68 Senior Member Join Date: May 2004 Location: AZ Posts: 779
This forum needs a sticky

Explain what C(x,y) and x! mean.

I always forget.
#2
12-20-2005, 08:49 PM
 uuDevil Senior Member Join Date: Jul 2003 Location: Remembering P. Tillman Posts: 246
Re: This forum needs a sticky

C(x,y)=x!/(y!*(x-y)!}

This is the number of combinations of x things taken y at a time.

E.G. the number of ways to be dealt pocket aces in Hold'em [/edit] is C(4,2)=4!/(2!*(4-2)!)=24/4=6 ways

x!= x*(x-1)*(x-2)*...3*2*1

E.G. 4!=4*3*2*1=24
#3
12-21-2005, 12:20 PM
 alThor Junior Member Join Date: Mar 2004 Posts: 6
Re: This forum needs a sticky

A sticky for FAQ's would be a good idea. The simplest would be to provide links to previous threads that discuss:

combinations/permutations

inclusion-exclusion

Monty Hall

Confidence intervals for win rates, etc. / Sample size

alThor
#4
12-21-2005, 06:10 PM
 tpir90036 Senior Member Join Date: Jul 2003 Posts: 563
Re: This forum needs a sticky

BruceZ gave me a good explanation of inclusion-exclusion back in the day in this thread. Make sure you read all the way to the end though as he made a revised response.

-tpir

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