dbweide235 dbweide235

24-01-2020
Mathematics

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How many 10-digit telephone numbers (area code + number) are possible if the first digit cannot be zero, the first three digits cannot be 800 or 900, and the number must end in 0000? A) 900,000 B) 898,000 C) 654.842D) 899,000

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Davwo98 Davwo98

25-01-2020

Answer: The answer is D

Step-by-step explanation:

Since the first digit must not be zero, and the first three digits must not be 900 or 800, the highest ten digits telephone number we can get is 899, since it is the highest number that is next in line to the forbidden numbers

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