S1 Probability Formulas 2.5 / 5 based on 4 ratings ? MathematicsProbabilityASEdexcel Created by: PhoebeCreated on: 05-10-13 20:42 Addition Law P(A u B) = P(A) + P(B) - P(A n B) OR P(A n B) = P(A) + P(B) - P(A u B) 1 of 8 Conditional Probability P(A n B) = P(A n B) / P(A) ∴ P(A|B) = P(A n B) / P(B) 2 of 8 Multiplication Law P(A n B) = P(B|A) x P(A) OR P(A n B) = P(A|B) x P(B) 3 of 8 Mutually Exclusive P(A or B) = P(A) + P(B) -- P(A n B) = 0 4 of 8 Multiplication Law for INDEPENDENT EVENTS P(A n B) = P(A) x P(B) -> P(A|B) = P(A) = P(AnB) = P(A) P(B) 5 of 8 Another useful formula P(A) = P(A n B) + P(A n B') 6 of 8 Another useful formula P(A) = P(A|B) x P(B) + P(A|B') x P(B) 7 of 8 Another useful formula P(A u B) = P(A) + P(B) - P(A) x P(B) 8 of 8
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