Mathematics, 14.06.2020 01:57 xxtonixwilsonxx
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 either 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
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Seven-digit telephone numbers are not allowed to begin with $0$ or $1$. I can only remember a seven-...
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