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The Northside Rifle team has two markspersons, Dick and Sally

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The Northside Rifle team has two markspersons, Dick and Sally. Dick hits the bull's-eye 90% of the time, and Sally hits the bull's-eye 95% of the time. a. What is the probability that either Dick or Sally or both will hit the bull's-eye if each takes one shot? b. What is the probability that Dick and Sally will both hit the bull's-eye?