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Q&A #3398

Teachers' Lounge Discussion: Permutations and counting arrangements

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From: Sarah

To: Teacher2Teacher Public Discussion
Date: 2004050609:16:30
Subject: Re: Re: HELP

1 1 a+n ------ + ------- = -------- (a-1)!n! a!(n-1)! a!n! a!(n-1)! + (a-1)!n! a+n --------------------- = ------ (a-1)!a!(n-1)!n! a!n! a(a-1)! (n-1)! + n(n-1)! (a-1)! a+n ------------------------------------- = ------ (a-1)!a!(n-1)!n! a!n! (a-1)!(n-1)! [a+n] a+n --------------------- = ----- (a-1)!(n-1)!a!n! a!n!

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