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probability

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Mr. Spark has problems starting his two cars during the winter. He decided to record the number of times each car starts during a 30-day period. He recorded the following information. His Hyundai started 18 times. His Subaru started 20 times. Both cars started 40% of the time.

What is the probability that, on any particular morning during a 30-day period,

a.) at least one car started?
b.)neither car started?

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