Tuesday, March 30, 2021

7.4. 4+12+20+28+.......................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+8*i-4;
printf("Sum= %d", sum); 
getch(); 
}

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