#include<stdio.h>
    #include<math.h>
    int main() {
    	float a,r,i,tn;
    	int n;
    	float sum=0;
    	printf("Enter the first number of the G.P. series: ");
    	scanf("%f",&a);
    	printf("Enter the total numbers in the G.P. series: ");
    	scanf("%d",&n);
    	printf("Enter the common ratio of G.P. series: ");
    	scanf("%f",&r);
    	sum = (a*(1 - pow(r,n+1)))/(1-r);
    	tn = a * (1 -pow(r,n-1));
    	printf("tn term of G.P.: %f",tn);
    	printf("\nSum of the G.P.: %f",sum);
    	return 0;
    }