Question

write a program in Java to find the sum of the given series S = 1 + (1*2) + 2 + (1*2*3) + 3 + ........ + 9 + (1*2*3* ........ 10)
Please tell fast ​

Answer 1

public class SeriesSum {

static long factorial(long number) {

return (number = = 1) ? 1 : number * factorial(number - 1);

}

public static void main(String[ ] args) {

int S = 0;

for (int i = 1; i < 10; S += ++i + (factorial(i + 1)));

System.out.println("Sum of series - " + S);

}

}

Answer 2

Answer:

Hope this would help you

Explanation:

class prog

{

public static void main(String args[])

{

int S=0, fact=1,c=1;

for(int i=1;i‹18=;i++)

{

if(i%2==0)

{ fact=fact*c;

S=S+fact;

}

else

S=S+(i-1);

c++;

}

}

}