# 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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3. 👁 33
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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