| Giver | Post | Date |
| Mystery123 | Re: The sum S of the arithmetic sequence a, a+d, a+2d,..., a+(n-1)d is giv | 24-Feb-2019 |
| Environo0792 | Re: The sum S of the arithmetic sequence a, a+d, a+2d,..., a+(n-1)d is giv | 07-Feb-2017 |
| gauravk | Re: The sum S of the arithmetic sequence a, a+d, a+2d,..., a+(n-1)d is giv | 28-Sep-2016 |