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Question: What is Tree Diagram ?

Answer:

A tree diagram is a diagram used to represent probabilities when two or more events are combined.

Suppose for example, a bag contains 3 red balls and 2 black balls. If two balls are drawn from the bag, one after the other, then there are four possible outcomes, RR, RB, BR, BB. These can be represented by a tree diagram, with the probabilities of drawing each ball along the branches.