The probability that a person is smart or thirsty is 0.7. The probability that they are smart or not thirsty is 0.9. What is the probability that a randomly selected person is smart?

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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The probability that a person is smart or thirsty is 0.7. The probability that they are smart or not thirsty is 0.9. What is the probability that a randomly selected person is smart?

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Confused as to where/how you derived  p(A∪B') = P(A) + P(A'∩B'). Am I missing something from a thereom?

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