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# How does one deal with Factorials? Is there a trick to

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Intern
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How does one deal with Factorials? Is there a trick to [#permalink]  02 Mar 2008, 14:22
How does one deal with Factorials? Is there a trick to dealing with them?

ie: What does this equal?

50!-40! / 40!+60!

Or

50! + 13

What's the trick so that you don't have to multiply out the whole thing?

Thanks.
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Re: Dealing with Factorials? [#permalink]  03 Mar 2008, 00:42
Liquid wrote:
How does one deal with Factorials? Is there a trick to dealing with them?

ie: What does this equal?

50!-40! / 40!+60!

Or

50! + 13

What's the trick so that you don't have to multiply out the whole thing?

Thanks.

= 50!-40! / 40!+60!
= 40! [(41x42x...x50) - 1]/40! [(1) + 41x42x43x....60)]
= [(41x42x...x50) - 1] / [(1) + 41x42x43x....60)]

Can not be done anything with "50! + 13".
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Intern
Joined: 21 Feb 2008
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Re: Dealing with Factorials? [#permalink]  03 Mar 2008, 17:37
Sorry, I'm not following your outline...
Re: Dealing with Factorials?   [#permalink] 03 Mar 2008, 17:37
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