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Seven-digit telephone numbers are not allowed to begin with 0 or 1 .

I can only remember a seven-digit telephone number if the first three digits (the "prefix") are equal to the next three digits or the last three digits. For example, I can remember 389-3892 and 274-9274.

How many seven-digit telephone numbers can I remember?

 Mar 24, 2021
 #1
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The number of seven-digit telepone number is 14876.

 Mar 25, 2021

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