AP Statistics Probability Formulas

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Multiplication Rule for Independent Events

P(A and B) = P(A) • P(B)

General Multiplication Rule

P(A and B) = P(A) • P(B|A)

For Mutually Exclusive Events

P(A or B) = P(A) + P(B)

General Addition Rule

P(A or B) = P(A) + P(B) - P(A and B)

Conditional Probability Formula

P(B|A) = P(A and B) / P(A)


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