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Looking for a step by step explanation of this so I can better understand these problems. A builder of airport terminals will win a contract

Looking for a step by step explanation of this so I can better understand these problems.

A builder of airport terminals will win a contract for construction of a terminal in Anaheim with a probability of 0.40; the probability that it will win a contract in Bakersfield is 0.30. The company has a 0.10 chance of winning the contracts in both cities. (a) What is the probability that the company will win at least one of these two cities? (b) Are the events "Wins contract for Anaheim" and "Wins contract for Bakersfield" independent? Explain why or why not.

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