SOLUTION: The probability a coffee shop customer uses sugar is .45, the probability of using cream is .35 and the probaility of using both is .20. Find the probability that a customer uses s

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Question 476721: The probability a coffee shop customer uses sugar is .45, the probability of using cream is .35 and the probaility of using both is .20. Find the probability that a customer uses sugar or cream.
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
.45+.35=.8
.8-.2=.6 is the probability that a customer uses sugar or cream. The .20 is subtracted, or otherwise it would be counted twice..