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The mathematics faculty at a college consists of 4 ​professors, 12 associate​ professors,12 assistant​ professors, and...

The mathematics faculty at a college consists of 4 ​professors, 12 associate​ professors,12 assistant​ professors, and 5 instructors. If one faculty member is randomly​ selected, find the probability of choosing a professor or an instructor.

The probability is ____

Math   Statistics-And-Probability   
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TOPIC:Classical definition of probability and additive law of probability.

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