Question

Write a program to find the sum of the series:
s= 1+(1*2)+(1*2*3)+......................(1*2*3*4*.....................*n)

Answer 1

import java.util.*;

public class Series

{

public static void main(String args[])

{

Scanner in =new Scanner(System.in);

int a,n,p=1,s=0;

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

n=in.nextInt();

{

p=p*a;

s=s+p;

}

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

}

}

Answer 2

Answer:

class Harmonic

{

public static void main(String…s)

{

int n,i;

float sum=0;

n=Integer.parseInt(s[0]);

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

{

sum=sum+(float)1/i;

}

System.out.println(“nSum=”+sum);

}

}

Explanation:

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