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# Stupid Math Question

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Intern
Joined: 16 May 2006
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14 Jun 2006, 15:17
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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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Director
Joined: 16 Aug 2005
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14 Jun 2006, 15:26
just look up Combination (as in Permutation-Combination) formula in a math tutorial
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I believe its yogurt!

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Manager
Joined: 29 Sep 2005
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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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Director
Joined: 06 May 2006
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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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GMAT Club Legend
Joined: 07 Jul 2004
Posts: 5032

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15 Jun 2006, 01:55
Combination Forumla: ncm = n!/(n-m)!(m!)

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15 Jun 2006, 01:55
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# Stupid Math Question

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