Posted by sh on Sunday, March 29, 2009 at 8:39pm.
close
(n+1)!/(n-1)!
= (n+1)(n)(n-1)!/((n+1)(n-1)!
= n
hmm..the answer key says its n(n+1), maybe the answer key is wrong
wait, nevermind, I got it :)
thanks :P
You know what?
I looked at "my work" and assumed that was the starting question.
so here it goes once more
(n+1)!/(n-1)!
= (n+1)(n)(n-1)!/n-1)!
= n(n+1)
sorry
I should be more careful when reading questions.
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