A bag contains 10 blue counters, 8 red counters and 6 green counters. Two counters are removed from the bag at random.
Draw a tree diagram to represent this information.
Find the probability that the two counters removed are both green.
Given that at least one of the counters removed is red, find the probability that both counters are red.
Practise Edexcel A Level Maths Conditional Probability with exam-style questions for A Level Maths. 100 questions covering Set Notation, Conditional Probability, Conditional Probabilities in Venn Diagrams, Probability Formulae, and Tree Diagrams, matched to the Edexcel A Level Maths (9MA0) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.