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5.What is the least number of area codes needed to guarantee that the 25 million phones in a state can be assigned distinct 10-digit telephone

5.What is the least number of area codes needed to guarantee that the 25 million phones in a state can be assigned distinct 10-digit telephone numbers? (Assume that telephone numbers are of the form NXX-NXX-XXXX, where the first three digits form the area code, N represents a digit from 2 to 9 inclusive, and X represents any digit.)

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