# WAP in C++ to Find the Sum of GP series

The Program in C++ to Find the Sum of GP series is given below:

``````#include <iostream>
#include <cmath>

using namespace std;

int main() {
double a, r, n;
double sum = 0;

cout << "Hello Codeauri Family, enter the first term of the series here: \n";
cin >>a;
cout << "Similarly,enter the common ratio here:\n";
cin >>r;
cout<< "and enter the number of terms here:\n";
cin >>n;

for (int i = 0; i < n; i++) {
sum += a * pow(r, i);
}

cout << "Well,the sum of the GP series is: " << sum << endl;

return 0;
}
``````

## Output:

Hello Codeauri Family, enter the first term of the series here:
5
Similarly,enter the common ratio here:
6
and enter the number of terms here:
7
Well,the sum of the GP series is: 279935

## Pro-Tips💡

This program prompts the user to enter the first term (a), common ratio (r), and number of terms (n) of a geometric progression (GP) series.

It then uses a for loop to calculate the sum of the series by adding up each term,

which is calculated using the formula: a * r^i, where i is the current term number (0-indexed).

Finally, it prints the sum of the series.

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