Question

write a program to find the sum of the series:
s = a- a/2+a/3-a/4..............-a/20

Answer 1

import java.util.*;

public class Series

{

public static void main(String args[])

{

Scanner in= new Scanner(System.in);

double a,n,s=0;

System.out.println("Enter the value of n");

n= in.nextDouble();

for(a=1;a<=n;a++)

s=s+1.0/Math.pow(2,a);

System.out.println("The sum of the series is="+s);

}

}

Answer 2

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programme for this series ,

refer to attachment