Higher November 2022 Paper 1 Q22
22. A box contains 10 coloured counters.
6 are red,
3 are blue,
1 is pink.
They are identical apart from their colour.
Fran takes a counter at random and keeps it.
Jon takes a counter at random from those that remain.
Find the probability that one of these counters is red and the other is blue. [3]
| Scheme | Marks | Comments |
|---|---|---|
| \(\left(\dfrac{6}{10} \times \dfrac{3}{9}\right) + \left(\dfrac{3}{10} \times \dfrac{6}{9}\right)\) | M2 | M1 for either product |
| \(\dfrac{36}{90}\) oe ISW | A1 | Must be from correct work, if shown |
| (3) |