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**Problem :-**Write a Program to calculate the sum of n terms of a Geometric Progression when first term a and common ratio r is given.

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**Solution :-**

#include <iostream>

using namespace std;

int main()

{

int t;

cin>>t;

while(t--)

{

int n,a,b,d,sum=0;

cin>>n;

cin>>a>>d;

sum=(n*((2*a)+((n-1)*d)))/2;

cout<<sum<<endl;

}

return 0;

}

**Output:-**

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