S1 Probability Key Points 3.0 / 5 based on 2 ratings ? MathematicsProbabilityStatistics, averages and distributionsA2/A-levelEdexcel Created by: Emily DruryCreated on: 05-05-13 11:51 P(event A or event B or both) P(A U B) 1 of 9 P(both events A and B) P(A n B) 2 of 9 P(not event A) P(A') 3 of 9 Complementary probability P(A') = 1 - P(A) 4 of 9 Addition rule P(A U B) = P(A) + P(B) - P(A n B) 5 of 9 Conditional probability P(A given B) P(A | B) = P(A n B) / P(B) 6 of 9 Mulitplication rule P(A n B) = P(A | B) x P(B) OR P(B | A) x P(A) 7 of 9 If A and B are independent... P(A | B) = P(A) OR P(B | A) = P(B) OR P(A n B) = P(A) x P(B) 8 of 9 If A and B are mutually exclusive... P(A n B) = 0 9 of 9

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