Posted by **sh** on Sunday, March 29, 2009 at 8:39pm.

Write the expression without using the factorial symbol.

(n+1)!/(n-1)!

my work:

(n+1)!/((n+1)(n-1)!)

=1/(n-1)?

Thanks in advance.

- math -
**Reiny**, Sunday, March 29, 2009 at 9:05pm
close

(n+1)!/(n-1)!

= (n+1)(n)(n-1)!/((n+1)(n-1)!

= n

- math -
**sh**, Sunday, March 29, 2009 at 9:23pm
hmm..the answer key says its n(n+1), maybe the answer key is wrong

- math -
**sh**, Sunday, March 29, 2009 at 9:26pm
wait, nevermind, I got it :)

thanks :P

- math -
**Reiny**, Sunday, March 29, 2009 at 9:28pm
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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