A bag contains 12 blue counters, 9 red counters and 3 green counters. Two counters are removed from the bag at random.
Find the probability that the two counters removed are both red and the probability that the two counters removed are different colours.
186 exam-style questions on Edexcel A Level Maths Probability, covering 5.1 Calculating Probabilities, 5.2 Venn Diagrams, 5.3 Mutually Exclusive and Independent Events, and 5.4 Tree Diagrams. Each one has a worked solution and a mark scheme showing where the marks go.