simplify 9C4! . . . . . . . . . . . . . . . . . . . . . . A. 126 . B. 15,120 . C. 5 . D. 3,024******

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1. I assume you mean 9C4

9C4! = 0

Anyway,

9C4 = 9!/(5!4!) = 9*8*7*6 / 4*2*3*1 = 126

9P4 = 9!/5! = 9*8*7*6 = 3024

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posted by Steve
2. thank you!

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posted by Me
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posted by oof
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