The probability of 3 customers being served in the order of their arrival is 1/6, determined using the exponential distribution model.
Probability can be calculated by understanding the exponential distribution model for customer arrivals. In this case, the probability that 3 customers waiting in a bank will be served in the sequence of their arrival at the bank is 1/6. This is because each of the 3 customers has an equal chance to be served first, second, or third.
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The probability that 3 customers waiting in a bank will be served in the sequence of the arrival at the bank is 1/6