Teacher2Teacher 
Q&A #3398 
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From: Andrea To: Teacher2Teacher Public Discussion Date: 2000101815:38:16 Subject: HELP I am a grade 13 or OAC student in Canada. I am currently taking a Finite class the is learning, at the moment, Combinatorics. I am having an extreamly difficult time with the concept of this chapter and was wondering if someone would be able to help. Here is an example question that has me stuck... Prove: 1 over (a1)!n! + 1 over a!(n1)! = a+n over a!n!
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