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A local computer store records show that 60% of customers making a purchase used a credit card to pay, while the rest paid cash. This

A local computer store records show that 60% of customers making a purchase used a credit card to pay, while the rest paid cash. This morning 10 customers made a purchase from the store. Assume that the method of payment for each purchase is independent of the others. What is the probability that exactly 4 customers paid by cash?

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