In a box there are only black pens, blue pens and green pens
A pen is taken at random from the box.
The table shows the probability of the pen being black and blue.
| Colour | Black | Blue | Green |
|---|---|---|---|
| Probability | 0.57 | 0.28 |
Verify that the probability that pen will be green is 0.15.
324 exam-style questions on CCEA GCSE Maths Probability. Each one has a worked solution and a mark scheme showing where the marks go.