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6/8 How many phone numbers (7 digits, without area code) can exist if the first three digits cannot be 911? This is a multi-step

6/8 How many phone numbers (7 digits, without area code) can exist if the first three digits cannot be 911? This is a multi-step problem. First figure out how many phone numbers there are possible with no restrictions. Second, how many phone numbers would start with 911? Subtract the two answers to get your answer:

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