Results 1 to 2 of 2

Math Help - Ordered pairs in a relation

  1. #1
    Junior Member
    Joined
    Sep 2009
    Posts
    62

    Ordered pairs in a relation

    Let A = {2,4,5,6,12,18} and define the relation PD on A by m PD n iff m is a proper divisor of n. List the ordered pairs in this relation.


    I know that this means m / n and m can not be equal to n. What I'm know understanding is how to come up with the ordered pairs? Can anyone help
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Member
    Joined
    Mar 2010
    From
    Bratislava
    Posts
    115
    Quote Originally Posted by tigergirl View Post
    Let A = {2,4,5,6,12,18} and define the relation PD on A by m PD n iff m is a proper divisor of n. List the ordered pairs in this relation.


    I know that this means m / n and m can not be equal to n. What I'm know understanding is how to come up with the ordered pairs? Can anyone help
    You simply try all possibilities, for instance 2|4, so the ordered pair (2,4) belongs to PD, but de pairs (4,2) and (2,5) do not.
    If I have not overlooked something, you should get these pairs (but try to do this on your own first, to see whether you really understand it).
    PD={(2,4),(2,6),(2,12),(2,18),(4,12),(6,12),(6,18) }.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. ordered of pairs
    Posted in the Algebra Forum
    Replies: 5
    Last Post: December 7th 2011, 12:05 PM
  2. ordered pairs
    Posted in the Pre-Calculus Forum
    Replies: 2
    Last Post: October 12th 2011, 07:39 PM
  3. How many different ordered pairs?
    Posted in the Geometry Forum
    Replies: 4
    Last Post: November 12th 2008, 04:37 PM
  4. Ordered Pairs (x,y)
    Posted in the Pre-Calculus Forum
    Replies: 4
    Last Post: June 11th 2007, 04:04 PM
  5. Two Ordered Pairs
    Posted in the Trigonometry Forum
    Replies: 2
    Last Post: June 9th 2007, 07:34 AM

Search Tags


/mathhelpforum @mathhelpforum