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 | 310\displaystyle \frac{3}{10}103 | 35\displaystyle \frac{3}{5}53 |
Verify that the probability of the counter being red is 110\displaystyle \frac{1}{10}101.
324 exam-style questions on AQA GCSE Maths Probability. Each one has a worked solution and a mark scheme showing where the marks go.