Solution-Three-digit telephone area code

Three-digit telephone area code

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Reference no: EM132441704

Problem: From 1951 to 1981, the first digit of every three-digit telephone area code in North America was a number from 2 to 9, inclusive. The second digit was either 0 or 1. The last digit depended on the following rules.

If the second digit was 0, the last digit could be any number from 1 to 9, inclusive
If the second digit was 1, the last digit could be any number from 2 to 9, inclusive.

Digits could be used more than once.

The number of different telephone area codes that could be formed with these restrictions was

A. 128

B. 136

C. 144

D. 153

Reference no: EM132441704

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Three-digit telephone area code

Reference no: EM132441704

Reference no: EM132441704

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