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 | 210\displaystyle \frac{2}{10}102 | 510\displaystyle \frac{5}{10}105 |
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.