Question

I have the following code that outputs 6,720. However after looking at the code I have no idea how the 720 is being gotten.

def f(n):
    if (n==0):
        return 1
    else:
        v = f(n-1)
        r = n * v
        return r

n = 6
print(n, f(n))

Answer 1

f(6) = 6  *  f(5)                                    = 720
              |------------------------------------
              5  *  f(4)                             = 120
                     |-----------------------------
                     4  *  f(3)                      =  24
                            |----------------------
                            3  * f(2)                =   6
                                  |----------------
                                  2  *  f(1)         =   2
                                         |---------
                                         1  *  f(0)  =   1
                                                |
                                                1    =   1  (base case)