Asked by Alondra

Assume an office has two telephones (A and B) with separate lines and different telephone numbers. The probability that telephone A rings when the office is closed is .30. The probability that telephone B rings when the office is closed is .20.

What is the probability that telephone A or B rings when the office is closed?
Answered by John
Based on what I did for the other two can you figure out this one?

What is your answer?
Answered by PsyDAG
Either-or probabilities are found by adding the individual probabilities.
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