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4. If the P(A)= 0.4, the P(B) = 0.3, and the P(A and B) = 0.2, what is the P(A or B)? (addition rule)

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4. If the P(A)= 0.4, the P(B) = 0.3, and the P(A and B) = 0.2, what is the P(A or B)? (addition rule)

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