AS/A2 Stats 2 Stats 3

S1 Topic 3: Probability
Complementary events
Move your mouse over the Venn diagram to see the set described. Various different way of describing the same set are given after the main one in green. Complementary events are mutually exclusive. Therefore: P(AÈA') = P(A) + P(A') = 1, or P(A') = 1 - P(A)

A

A' not A A complement

AÈA' A or not A

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