Which of the Following Mathematical Expressions Represents the Sum Rule

question 62

Multiple Choice

Which of the following mathematical expressions represents the sum rule, which can be used to determine the probability of either event X or event Y occurring if they CANNOT occur simultaneously? (In the equations below, P_x means probability of event X; P_y means probability of event Y.)

• A) = (P_x)² + (P_y)²
• B) = P_x + P_y
• C) = P_xP_y
• D) = (P_x + P_y)²

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