7.16. 5.6.7+6.7.8+7.8.9+..................upto n'th term.

#include<stdio.h> 
#include<conio.h>
void main ()
{
int i,n, sum=0;
clrscr ();
printf("How many number: ");
scanf("%d", &n);
for (i=1; i<=n, i++)
sum=sum+(i+4)*(i+5)*(i+6);
printf("Sum= %d", sum); 
getch(); 
}