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Forty percent of people traveling on business carry a cell phone or laptop. In a sample...

Forty percent of people traveling on business carry a cell phone or laptop. In a sample of 15 people,
a. What is the probability that three will have a cell phone or a laptop?
b. What is the probability that 12 of the travelers do not have a cell phone or laptop?
c. What is the probability that at least three have both?
Math   Statistics-And-Probability   
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