Probability trees are visual representations of all the possible outcomes in a given event. In terms of basics of probability, there is nothing new here; the only new thing is the representation of all outcomes into visual form. Applications of basics that are learnt earlier remain unchanged. Probability trees are helpful in calculating probabilities when events get long and complicated so make sure you know how probability trees are drawn.
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A coin is flipped three times. Represent all possible outcomes and their probabilities in a probability tree.