Geeksforgeeks Solution For " Sum of GP "

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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:-