C. The Multiplication Law

This law is used to find the intersection of two events, P(A?B).

Recall: P(A|B) = P(A?B)/P(B)

Rewrite this and you have the multiplication law.

P(A?B) = P(A|B)•P(B), or

P(A?B) = P(B|A)•P(A)

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