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Q&A #3398

Teachers' Lounge Discussion: Permutations and counting arrangements

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From: Onder

To: Teacher2Teacher Public Discussion
Date: 2008030523:22:01
Subject: Re: HELP

1 + 1 a+n ----------- ---------- = ------ (a-1)!n! a!(n-1)! a!n! multiply the first fraction with a and second fraction with n to make the denominators same.-> a!n! a + n a+n ----------- ---------- = ------ a(a-1)!n! a!n(n-1)! a!n! a(a-1)!=a! and n(n-1)!=n! so a + n a+n ----------- ---------- = ------ a!n! a!n! a!n!

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