| Calculate Sum of Arithmetic Series Terms, Given the First Term, -1/2, the Common Difference, -1/2 and the Last Term, -20 | May 29 01:18 UTC (GMT) |
| Calculate Sum of Arithmetic Series Terms, Given the First Term, -1/2, the Common Difference, -1/2 and the Last Term, -20.5 | May 29 01:18 UTC (GMT) |
| Calculate Sum of Arithmetic Series Terms, Given the First Term, 1, the Common Difference, 1 and the Last Term, 204 | May 29 01:18 UTC (GMT) |