Python: Find the number of combinations of a,b,c and d

Python Basic - 1: Exercise-37 with Solution

Write a Python program which reads an integer n and find the number of combinations of a,b,c and d (0 ≤ a,b,c,d ≤ 9) where (a + b + c + d) will be equal to n.

Input:
n (1 ≤ n ≤ 50)

Sample Solution:

Python Code:

import itertools
print("Input the number(n):")
n=int(input())
result=0
for (i,j,k) in itertools.product(range(10),range(10),range(10)):
    result+=(0<=n-(i+j+k)<=9)
print("Number of combinations:",result)

Sample Output:

Input the number(n):
 15
Number of combinations: 592

Flowchart:

Python Code Editor:

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