#include<stdio.h>
#inculde<math.h>
int main ()
{
int R,n,A;
float S;
printf("plz give me the value of N elements:");
scanf("%d",&n);
printf("plz give me the value of the first term A:");
scanf("%d",&A);
printf("plz give me the ratio between 2 consecutive elements R:");
scanf("%d",&R);
S=(pow(R,n)-1)*A/(R-1);
printf("the value of the sum of a geometric series Sn=%f",S);
getchar(0);
return(0);
}
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