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  #1  
Old 12-20-2005, 08:16 PM
Beavis68 Beavis68 is offline
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Default This forum needs a sticky

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


I always forget.
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  #2  
Old 12-20-2005, 08:49 PM
uuDevil uuDevil is offline
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Default 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 [edit]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
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  #3  
Old 12-21-2005, 12:20 PM
alThor alThor is offline
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Default 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

various ROR threads

Monty Hall

Confidence intervals for win rates, etc. / Sample size

others? And please provide suggested links. Multiple links per topic might also be reasonable.

alThor
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  #4  
Old 12-21-2005, 06:10 PM
tpir90036 tpir90036 is offline
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Default 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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