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Dr. Math's four-digit house number ABCD contains no zeroes and can be split into two different two-digit primes ``AB'' and ``CD'' where the digits A, B, C and D are not necessarily distinct. If each of the two-digit primes is less than 20, how many such house numbers are possible?

 Dec 8, 2020
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https://web2.0calc.com/questions/last-question-running-late-please-help

 Dec 8, 2020

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