Results 1 to 5 of 5

Math Help - Number combinations ...

  1. #1
    Newbie
    Joined
    Mar 2008
    Posts
    3

    Number combinations ...

    So... Let's say we have the numbers :

    01 02 03 04 05
    06 07 08 09 10
    11 12 13 14 15
    16 17 18 19 20
    21 22 23 24 25

    If you need to choose 15 of them , I would like to know what's all the possible combinations .
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Eater of Worlds
    galactus's Avatar
    Joined
    Jul 2006
    From
    Chaneysville, PA
    Posts
    3,001
    Thanks
    1
    How many ways to choose 15 out of 25 numbers?.

    C(25,15)=3,268,760
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Mar 2008
    Posts
    3
    well... ok, but how to use this formula ?
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Eater of Worlds
    galactus's Avatar
    Joined
    Jul 2006
    From
    Chaneysville, PA
    Posts
    3,001
    Thanks
    1
    Most calculators do combinations. That's what I used to do this one.

    The formula is C(n,k)=\frac{n!}{(n-k)!k!}

    Do you know what a factorial is?. That's what the exclamation points are.
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Newbie
    Joined
    Mar 2008
    Posts
    3
    But I mean all possible combinations, without repeating them in a different order.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Number of combinations
    Posted in the Discrete Math Forum
    Replies: 6
    Last Post: February 28th 2011, 02:11 PM
  2. number of combinations possible
    Posted in the Statistics Forum
    Replies: 1
    Last Post: March 25th 2009, 08:28 AM
  3. number of possible combinations...
    Posted in the Discrete Math Forum
    Replies: 3
    Last Post: February 6th 2009, 07:17 AM
  4. number of combinations
    Posted in the Statistics Forum
    Replies: 2
    Last Post: August 14th 2008, 09:11 AM
  5. number of combinations
    Posted in the Statistics Forum
    Replies: 3
    Last Post: May 14th 2008, 06:29 PM

Search Tags


/mathhelpforum @mathhelpforum