| Calculate Sum of Arithmetic Series Terms, Given the First Term, -1/2, the Common Difference, -1/2 and the Last Term, -20.5 | Apr 04 00:22 UTC (GMT) |
| Calculate Sum of Arithmetic Series Terms, Given the First Term, -11/2, the Common Difference, -2 and the Last Term, -27/2 | Apr 04 00:16 UTC (GMT) |
| Calculate Sum of Arithmetic Series Terms, Given the First Term, -2, the Common Difference, -1/2 and the Last Term, -85.5 | Mar 31 22:34 UTC (GMT) |