SUM OF SQUARES OF THE SERIES 12+22+32+--------+n2

#include<stdio.h>

#include<conio.h>

void main()

{

  long int r;

  clrscr();

  printf("\nEnter the range: ");

  scanf("%ld",&r);

  printf("\nSum of the squares of the series is: %ld",((r*(r+1))*(2*r+1))/6);

  getch();

}