Help with Counting in Algebra4

label Algebra
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A student is asked to answer 7 out of 10 questions on an exam. In how many ways can she select the questions to be answered? (Order is not important.)
Dec 1st, 2014

10C7= 10! / (10-7)! *7!

         = 10! / 3!*7!

         = 10*9*8*7! / 3*2*1*7!

         = 120 ways

Dec 1st, 2014

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Dec 1st, 2014
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