Question: help me do this problem The length of time for one individual to be served at a cafeteria is a random variable having an exponential

help me do this problem

The length of time for one individual to be served at a cafeteria is a random variable having an exponential distribution with a mean of 6 minutes. What is the probability that a person is served in less than 3 minutes on at least 3 of the next 5 days

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