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

## Python Basic - 1: Exercise-37 with Solution

Write a Python program that reads an integer n and finds 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)

Input the number(n): 15

Number of combinations: 592

**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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**Previous:** Write a Python program to compute the amount of the debt in n months. The borrowing amount is $100,000 and the loan adds 5% interest of the debt and rounds it to the nearest 1,000 above month by month.

**Next:** Write a Python program to print the number of prime numbers which are less than or equal to an given integer.

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