摘要：Tree diagramsare visual ways of understanding probabilities involving more than one event.Conditional probabilityis the mathematic

Tree diagrams are visual ways of understanding probabilities involving more than one event. Conditional probability is the mathematical formulation of this understanding. Ultimately – both help us answer the same question: what is the probability of an event happening given that a related event has already happened?

Make sure you are happy with the following topics before continuing.

来源：安娜说留学