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Refer to Exercise 6 11 a What is the probability that

Refer to Exercise 6.11.

a. What is the probability that a customer does not use a credit card?

b. What is the probability that a customer pays in cash or with a credit card?

a. What is the probability that a customer does not use a credit card?

b. What is the probability that a customer pays in cash or with a credit card?

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