Results 1 to 2 of 2

Math Help - help with simplifying something

  1. #1
    Gul
    Gul is offline
    Junior Member
    Joined
    Oct 2008
    From
    Brisbane
    Posts
    25

    help with simplifying something

    If you have:

    n!(n+1), that simplifies to (n+1)!

    but how would you do that for:

    (n-r)!(n-r-1)!

    or

    (r+1)!(r!)



    Thanks in advance.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor

    Joined
    Aug 2006
    Posts
    18,922
    Thanks
    1762
    Awards
    1
    Quote Originally Posted by Gul View Post
    (n-r)!(n-r-1)! or (r+1)!(r!)
    \begin{gathered}<br />
  \left( {n - r} \right)!\left( {n - r - 1} \right)! = \left( {n - r} \right)\left[ {\left( {n - r - 1} \right)!} \right]^2  \hfill \\<br />
  \left( {r + 1} \right)!\left( {r!} \right) = \left( {r + 1} \right)\left( {r!} \right)^2  \hfill \\ <br />
\end{gathered}
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Help Simplifying
    Posted in the Algebra Forum
    Replies: 1
    Last Post: September 12th 2009, 09:01 AM
  2. Help simplifying
    Posted in the Algebra Forum
    Replies: 3
    Last Post: September 12th 2009, 05:51 AM
  3. simplifying
    Posted in the Algebra Forum
    Replies: 2
    Last Post: October 5th 2008, 11:34 AM
  4. Need help simplifying
    Posted in the Algebra Forum
    Replies: 2
    Last Post: November 20th 2007, 06:04 PM
  5. simplifying sin and cos
    Posted in the Trigonometry Forum
    Replies: 4
    Last Post: November 5th 2007, 10:58 AM

Search Tags


/mathhelpforum @mathhelpforum