Math

Evaluate: 7^C4


i think its something like:
(7*6*5*4*3*2*1) / ((2*1)(4*3*2*1)) = (7*6*5*4)/(4*3*2*1) = (7*6*5)/(2*1) = 105...did i do i right??

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asked by Jen
  1. Oh, you mean combinations

    7!/[ 4!(7-4)!]

    7! / [4!*3!]

    7*6*5/3!

    7*6*5/(3*2)

    7*5

    35

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    posted by Damon
  2. You are still writing the notation incorrectly, there is no exponent.

    7C4 is what you want

    also written as C(7,4)

    the value is
    7!/(4!3!) = 7*6*5/(3*2) = 35

    or 5040/(24*6) = 35

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    posted by Reiny
  3. i know i just don't know how to input it correctly on my computer :(

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    posted by Jen

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