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Leaving Cert. Permutation problem

  • 03-10-2013 7:54pm
    #1
    Daaazler
    Registered Users, Registered Users 2 Posts: 5 ✭


    4 Girls and 5 Boys are to be lined up. How many arrangements are possible if two particular boys must be kept apart?


Comments

  • #2
    Ciaran
    Registered Users, Registered Users 2 Posts: 938 ✭✭✭Ciaran


    How many arrangements are possible in total? How many are possible with the two boys together?


  • #3
    TheBody
    Registered Users, Registered Users 2 Posts: 5,633 ✭✭✭TheBody


    Ciaran wrote: »
    How many arrangements are possible in total? How many are possible with the two boys together?

    That's what I'd do too. Then take one from the other.

    @ op, it's against the charter to just give you solutions. Have a go at the suggestion above and let us know how you get on.


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