//Math.pow(R,n), R to the power of n
//a * R to the power of n and divided by R - 1

package tutorial;

import java.util.Scanner;

public class CalSumOfGeo {
    public static void main(String[] args){
        double a, R, n;
        double sumOfGeo;
        Scanner input = new Scanner(System.in);
    
    System.out.print("Enter the first number of the sequence: ");
        a = input.nextDouble();
    
    System.out.print("Enter the common ratio of the sequence: ");
        R = input.nextDouble();
    
    System.out.print("Enter the number of the terms of the sequence: ");
        n = input.nextDouble();
    
    sumOfGeo = (a*(Math.pow(R,n)-1))/(R-1);
    
    System.out.print("The sum of Geometric Series: ");
    System.out.printf("%1.1f\n" , sumOfGeo);
                
    }
}