In a bag there are only black counters, white counters and red counters.
A counter is taken at random from the bag.
The table shows the probability of taking a black counter and a white counter.
| Colour | Black | White | Red |
|---|---|---|---|
| Probability | 15\displaystyle \frac{1}{5}51 | 35\displaystyle \frac{3}{5}53 |
Work out the probability of taking a black counter or a white counter.
Hence complete the table to show the probabilities of the counter being red.
324 exam-style questions on OCR GCSE Maths Probability. Each one has a worked solution and a mark scheme showing where the marks go.