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# Sum of sum of first n natural numbers in C++

In this problem to find the sum of sum of first n natural numbers, we will find the sum of all numbers from 1 to n and add them together to find the sum.

Let’s take an example to learn about the concept,

Input : 4 Output : 10 Explanation : Sum of first 1 natural number = 1 Sum of first 2 natural number = 1 + 2 = 3 Sum of first 3 natural number = 1 + 2 +3 = 6 Sum of first 4 natural number = 1 + 2 + 3 + 4 = 10 Sum of sum of 4 natural number = 1 + 3 + 6 + 10 = 20

## Example

#include <iostream> using namespace std; int sumofSum(int n){ int sum = 0; for (int i=1; i<=n; i++) sum += i*(i+1)/2; return sum; } int main(){ int n = 4; cout<<"sum of sum first "<<n<<"natural numbers is "<<sumofSum(n); return 0; }

## Output

sum of sum first 4natural numbers is 20

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