Function value 1 26 24 120 720 5040 to solve function analytic formula Give a process the best

1=1
2=2*1
6=3*2*1
24=4*3*2*1
120=5*4*3*2*1
.
f(n)=n(n-1)(n-2)...3*2*1
=N! (Note: n is a positive integer)

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