Results 1 to 4 of 4

Math Help - Permutation and combination doubt?

  1. #1
    Member
    Joined
    Jan 2009
    Posts
    197

    Exclamation Permutation and combination doubt?

    I have learned that permutation deals with arrangement and order while combination deals with arrangement but the order is not important.
    I understand the definition but when a question comes I can't distinguish which formula to use either permutation or combination :'(

    example
    in how many ways can 5 starting position on a NBA team be filled with 12 men who can play any of the position?

    (What is it and what shall I use? And how to distinguish permutation and combination question really feeling confused ?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Senior Member apcalculus's Avatar
    Joined
    Apr 2009
    From
    Boston
    Posts
    293
    Quote Originally Posted by mj.alawami View Post
    I have learned that permutation deals with arrangement and order while combination deals with arrangement but the order is not important.
    I understand the definition but when a question comes I can't distinguish which formula to use either permutation or combination :'(

    example
    in how many ways can 5 starting position on a NBA team be filled with 12 men who can play any of the position?

    (What is it and what shall I use? And how to distinguish permutation and combination question really feeling confused ?
    The order you list your five players does not matter so you use permutations.

    12 times 11 times 10 times 9 times 8 =

    If, on the other hand, you were looking at the number of ways you can sit five people around a dining table then you would use combinations.

    Hope this helps!
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Member
    Joined
    Jan 2009
    Posts
    197
    Quote Originally Posted by apcalculus View Post
    The order you list your five players does not matter so you use permutations.

    12 times 11 times 10 times 9 times 8 =

    If, on the other hand, you were looking at the number of ways you can sit five people around a dining table then you would use combinations.

    Hope this helps!
    in permutation isn't order important and in combination it isn't. So why are your definition the wrong way round
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Senior Member apcalculus's Avatar
    Joined
    Apr 2009
    From
    Boston
    Posts
    293
    the other way around, of course.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Permutation and Combination
    Posted in the Statistics Forum
    Replies: 2
    Last Post: January 17th 2011, 05:35 AM
  2. Permutation or Combination?
    Posted in the Discrete Math Forum
    Replies: 2
    Last Post: December 13th 2009, 06:47 PM
  3. Permutation doubt
    Posted in the Discrete Math Forum
    Replies: 3
    Last Post: June 6th 2009, 07:07 AM
  4. Permutation and Combination
    Posted in the Statistics Forum
    Replies: 3
    Last Post: October 21st 2008, 08:14 AM
  5. Permutation and Combination Help!
    Posted in the Statistics Forum
    Replies: 6
    Last Post: March 18th 2008, 01:21 PM

Search Tags


/mathhelpforum @mathhelpforum