Texas HS Advanced Quantitative Reasoning Question of the Day

Test your knowledge with a hand-picked multiple-choice question.

A new Texas area code allocates central office prefixes of the form NXX where N is 2–9 and each X is 0–9. Exclusions: all N11 codes (e.g., 211, 311, …, 911) and any code whose last digit is 9. How many prefixes are available?

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