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math

posted by on .

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 - ,

    close

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

  • math - ,

    hmm..the answer key says its n(n+1), maybe the answer key is wrong

  • math - ,

    wait, nevermind, I got it :)
    thanks :P

  • math - ,

    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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