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A mail-order department store has 7 telephone lines available for customers who wish to place their orders. If the probability that during business hours any

A mail-order department store has 7 telephone lines available for customers who wish to place their orders. If the probability that during business hours any one of the 7 telephone lines is engaged is3/10, find the probability that when a customer calls to place an order all 7 lines will be in use.

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