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12.2 Combinations and the Binomial Theorem - …
www.classzone.comPage 1 of 2 12.2 Combinations and the Binomial Theorem 709 When finding the number of ways both an event A and an event B can occur, you need to multiply (as you did in part (b) of Example 1). When finding the number of ways that an event A or an event B can occur, you add instead. Deciding to Multiply or Add