There are some counters in a bag. The table shows the number of counters of each colour.
| Colour | Red | Blue | Yellow | Green |
|---|---|---|---|---|
| Number of Counters | 7 | 2 | 5 | 3 |
A counter is taken at random from the bag.
Write down the probability that the counter is green or blue.
236 exam-style questions on OCR GCSE Maths Probability. Each one has a worked solution and a mark scheme showing where the marks go.