def factorial(num)
(1..num).inject(:*)
end
3!
factorial 3 #=> 6
10!
factorial 10 #=> 3628800
15!
factorial 15 #=> 1307674368000
Factorial function in Ruby
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def factorial(num)
(1..num).inject(:*)
end
factorial 3 #=> 6
factorial 10 #=> 3628800
factorial 15 #=> 1307674368000