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The mathematical operation problems of civil servants are arranged and combined as follows, in which C9(3)=84? How to calculate. Please give specific calculation steps.
C9(3)= 9！ /[3! *(9-3)! ]

Exclamation mark stands for factorial calculation, 9! =9*8*7*6*5*4*3*2* 1

3! =3*2* 1, (9-3)! =6! =6*5*4*3*2* 1

We get: 9*8*7/(3*2* 1)= 3*4*7=84.

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