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
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