S= 1*2 + 2*3 + 3*4 + ……..+ n * (n+1) solve the equation [ loop series ]

 



#include<stdio.h>
#include<conio.h>
#include<math.h>
int main(int argc, char const *argv[])
{
  int x,n,i;
  float m,c,y,sum=0;

  printf("enter the value of  n :");
  scanf(" %d",&n);

  
  for ( i = 1; i <= n; i++)
  {
    y=i*(i+1);
    printf(" %f",y);
    sum=sum+y;
  }

    m=sum;
  printf("\nsum of series = %f",m);
  return 0;


}

output :

enter the value of n :8 2.000000 6.000000 12.000000 20.000000 30.000000 42.000000 56.000000 72.000000 sum of series = 240.000000

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