#42
Factorial Fun
 

Difficulty:N/A
Topics:easy math


Write a function which calculates factorials.
test not run
(= (__ 1) 1)
test not run
(= (__ 3) 6)
test not run
(= (__ 5) 120)
test not run
(= (__ 8) 40320)


Code which fills in the blank: