from fac import *

def pr (n,r):
    if n < 0 or r < 0:
        print ("Los numeros deben ser mayor o iguales a 0")
        return
    else:
        x = fac(n)
        c = n-r
        b = fac(c)
    return (x/b)
        
        

pr(5,3)

def com (n,r):
    if n < 0 or r < 0:
        print ("Los numeros deben ser mayor o iguales a 0")
        return
    else:
        x = fac(n)
        y = fac(r)
        a = n-r
        b = fac(a)
    return (x/((b) * y))

com(16,5) 

def fac (n):
    for i in range (1,n):
        n = n*i
    return (n)
        

fac(16)

def fac4 (a,b,c):
    x = fac(a)
    y = fac(b)
    z = fac(c)
    return (x,y,z)

fac4(8,20,100)

com (16,5) * com(11,3) * com(8,2)

com (16,5)

com (11,3)

com (8,2)

28*4368*165