Continuing with our series of videos covering all the questions from the 2018 Edexcel Higher Tier GCSE Maths Paper 3, Best Maths Tutors covers question 3, which is about probability trees. Here we are asked to look at a probability tree that has been incorrectly drawn and identify some of the errors. To do this we need to know a couple of the probability rules, such as the fact that the sum of all possible probabilities is one.
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