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Probability tree diagrams are just a picture that show all the possible outcomes from a series of events. They can be quite useful as probability needs some careful thought.

This video deals with a GCSE question: There are 3 strawberry yoghurts and 4 peach yoghurts in a fridge. Kate takes a yoghurt at random from the fridge. She eats the yoghurt. She then takes a second yoghurt at random from the fridge. Work out the probability that both yoghurts are the same flavour.

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