A bag contains 12 blue counters, 9 red counters and 7 green counters. Two counters are removed from the bag at random.
Find the probability that the two counters removed are both red.
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.