Intermediate November 2022 Unit 1 Q2
2. Two friends, Geraint and Dyfrig, are having a discussion.
(a) Geraint says,
“All prime numbers are odd numbers.”
Explain why Geraint is incorrect. [1](b) Dyfrig says,
“All cube numbers are odd numbers.”
Explain why Dyfrig is incorrect. [1]| Scheme | Marks | Comments |
|---|---|---|
| Any valid explanation or counter example e.g. “2 is a prime” “2 is even” “2 is not odd” | E1 | Do not accept 2 alone. The number 2 must appear in the explanation. |
| Scheme | Marks | Comments |
|---|---|---|
| Any valid explanation or counter example e.g. “8 is a cube” “64 is even” | E1 | Do not accept number alone, but allow e.g. 23 = 8. A numerical example must appear in the explanation. If a numerical example is given it must be correct or not contradicted e.g. “2 × 2 × 2 = 16 is even" would be awarded E0 “2 × 2 × 2 is even" would be awarded E1. If two examples are given, one must be correct for E1. If no marks awarded in (a) and (b), award SC1 for correct number only in both parts e.g. 2 in (a) AND 8 (or any other even cube) in (b). |