Page 180 - CA_Blue( J )_Class10
P. 180
}
}
25. Write a program to find and display the sum of the following series:
s = 1/2+2/4+3/6+4/8+…+n terms
Ans. import java.util.*;
class series1
{
public static void main () {
Scanner sc = new Scanner (System.in);
int n;
double i,sum=0.0;
System.out.println("Enter n terms: ");
n=sc.nextInt();
for (i=1; i<=n; i++)
{ sum=sum+i/(i*2); }
System.out.println("Result: "+sum);
}
}
26. Write a program to find and display the sum of the following series:
2
3
s = 1 - x + x - x + … + n terms
Ans. import java.util.*;
class series2
{
public static void main () {
Scanner sc = new Scanner (System.in);
int n,i;
double sum=0.0,x;
System.out.println("Enter n terms: ");
n=sc.nextInt();
System.out.println("Enter x :");
x=sc.nextDouble();
for (i=1; i<n; i++)
{ if(i%2==0)
sum = sum - Math.pow(x,i);
else
sum = sum + Math.pow(x,i);
}
sum = 1 - sum;
System.out.println("Result: "+sum);
}
}
27. Write a program to print the sum of the series.
s= (5*4*3*2*1)+(4*3*2*1)+(3*2*1)+(2*1)+1
Ans. import java.util.*;
class Series{
int i, n, sum=0;
public static void main() {
int n = 5;
int sum=0;
int p = 1;
for(int i=1; i<=n; i++) {
sum += p;
p += p * i;
}
System.out.println(sum);
}
}
178178 Touchpad Computer Applications-X

