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Stupid Math Question [#permalink] New post 14 Jun 2006, 15:17
Hi, I'm sure one of you guys will be able to help me out.

How do you calculate problems such as

6C5 or 7C5????

Thanks
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 [#permalink] New post 14 Jun 2006, 15:26
just look up Combination (as in Permutation-Combination) formula in a math tutorial
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Re: Stupid Math Question [#permalink] New post 14 Jun 2006, 16:53
neemo wrote:
Hi, I'm sure one of you guys will be able to help me out.

How do you calculate problems such as

6C5 or 7C5????

Thanks


6C5 will be

6!/((6-5)!*5!
=6!/(1!*5!)
=6*5!/5!--->split 6! into 6*5! so you can cancel out the terms)
= 6

Hope this helps.
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 [#permalink] New post 15 Jun 2006, 00:58
More important, of course, is to understand what 6C5 implies, as opposed to, say, 6P5 :) I never remember what xPy and xCy mean, but I do know which formula to use! I guess, I'll learn it today, though...
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 [#permalink] New post 15 Jun 2006, 01:55
Combination Forumla: ncm = n!/(n-m)!(m!)
  [#permalink] 15 Jun 2006, 01:55
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