probability tree

Diagrammatic representation of possible outcomes of series of events. A probability tree to calculate the chances of flipping a coin and coming up heads three times in a row would have three levels. The first reflects the chances of throwing either heads or tails; the second level reflects the chances of throwing heads or tails after throwing heads the first time, and the chances of throwing heads or tails after throwing tails the first time: the third level shows the chances of throwing heads or tails after all the possible outcomes of the first two throws. The series of probabilities can be multiplied to give the overall probability of a possible event occurring.