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January 13th, 2009, 01:05 AM   #1
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Solving for N in permutation problems

Please help me in this one..i'm quite confuse...

How am I going to solve for n in permutation problems like this

P(n, 1) = 7

please give me any hint...can you pls give it now..im waiting
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January 13th, 2009, 12:46 PM   #2
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Re: Solving for N in permutation problems

Quote:
Originally Posted by sheen_daphne
Please help me in this one..i'm quite confuse...

How am I going to solve for n in permutation problems like this

P(n, 1) = 7

please give me any hint...can you pls give it now..im waiting
It would help if you could define P(n,1).
mathman is offline  
January 13th, 2009, 04:45 PM   #3
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Re: Solving for N in permutation problems

p(n,k) = n!/(n-k)!

P(n,1) = n!/(n-1)! = 7

Think about how factorial is defined. Try replacing n! with x*y! for some x and y. And it should fall right out.
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