In constructing a probability tree, probabilities beyond the first stage are conditional probabilities and the multiplication rule is used to get end node probabilities.

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In a probability tree, probabilities beyond the first stage are indeed conditional probabilities, reflecting the probability of an event given the occurrence of a previous event. The multiplication rule is used to calculate the probability of a sequence of events by multiplying the probabilities along the branches leading to an end node.

In Constructing a Probability Tree, Probabilities Beyond the First Stage