Probability Notation and Formula Sheet

Complement: P(not A) = 1 - P(A)
Addition: P(A or B) = P(A) + P(B) - P(A and B)
Conditional: P(A given B) = P(A and B) / P(B)
Multiplication: P(A and B) = P(A given B)P(B)
Independent product: P(A and B) = P(A)P(B)
Odds in favor: P(A) / [1 - P(A)]
Always define events, denominators, and independence assumptions.

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