| Correct (3) | Buggy (2) | Missing or very wrong (0) | |
|---|---|---|---|
| Main answer | Formula is entirely correct. ok to use factorials, fractions, etc. Simplifying to a single number is not required. | Small mistakes, e.g. off by one errors, didn't see a pair of duplicate letters in a word. (Justification/work often helps us understand why a mistake is small.) | Major mistakes, e.g. using the wrong formula. |
| Correct (1) | Missing or very wrong (0) | ||
| Work or justification | Present, seems related to answer, and appropriate length. Informal is ok as long as graders can understand it. | Missing, apparently not related to answer, very long (e.g. formal proof). |
| Correct (1) | Missing or very wrong (0) | ||
|---|---|---|---|
| Isomophic or not | True/False is correct and stated. | No answer to the true/false given or answer is wrong. | |
| Correct (3) | Buggy (1) | Missing or Wrong (0) | |
| Justification | Mapping given if isomorphic or feature that breaks isomphism given if not isomorphic. | Small error in mapping or poorly defined feature. Note you can get this point even if incorrect. | Missing, apparently not related to answer, very long (e.g. formal proof). |