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Tree diagrams organise multi-stage probability problems into a clear visual structure. Students multiply along branches for combined probabilities and add between branches for alternative outcomes.
Our tutors see these errors again and again. Knowing them in advance gives you a head start.
Adding probabilities along a branch instead of multiplying
Forgetting to adjust probabilities for the second event in without-replacement problems
Not including all relevant branches when answering the question
This topic is tested by the following exam boards. Our tutors are specialists in each one.
Basic probability introduces the scale from 0 to 1 and the idea of equally likely outcomes. Students calculate probabilities of single events, understand mutually exclusive events, and work with the probability that something does not happen.
ProbabilityConditional probability deals with the likelihood of an event given that another event has already occurred. This higher-tier topic uses tree diagrams, two-way tables and Venn diagrams to calculate P(A given B).
ProbabilityCombined events involve finding the probability of two or more things happening together or in sequence. Students use the addition rule for OR and the multiplication rule for AND, applying these to independent and dependent events.
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