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    bat7130 Posts: 1, Reputation: 1
    New Member

    May 7, 2007, 02:51 PM
    Evaluating Expressions
    How do you answer

    Evaluate P(9,6)


    Evaluate C(7,5)

    I have no idea what I'm supposed to do.
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307

    May 8, 2007, 12:53 PM
    The definition pf permutataions and combinations should be in your text book. Briefly, P(a,b) is the permutation of 'a' things taken 'b' at a time. Typically used to calcualte how many different ways one can order 'b' items selected from a group of 'a' items when order is important. It is calculated: P(a,b) = a!/(a-b)!

    For combinations, it's the permutation divided by b!: C(a,b) = a!/[(a-b)!*b!]. Typically used to determine how many ways one can select 'b' items from a group of 'a' when order is not important.

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