math help =( |
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 May 26 2005, 11:35 PM
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#1
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 jellyfishing, jellyfishing  Group: Member Posts: 1,174 Joined: Oct 2004 Member No: 55,185  |
okay...i just don't seem to get this problem. It has to do with factorials....
If 4! = 4 x 3 x 2 x 1 OR 4(4-1)(4-2)(4-3) and 4!/2! = 4 x 3 x 2 x 1/2 x 1 = 12 FIND: (n-1)!n/(n+1)! Yeah...I'm pretty much lost. Can someone explain to me how to solve it, not the answer but maybe a way to get me started or uh, how to do it. |
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May 29 2005, 12:46 PM
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#2
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 hi. call me linda. Group: Official Member Posts: 8,187 Joined: Feb 2004 Member No: 3,475 |
Ok, well for the numerator, it is the same as n! (since you have (n-1)!, and then are multiplying by n) and the denominator is (n! * (n+1)). And then you can cancel out the n!
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