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The integer 113 is a prime, and its reverse 311 is also a prime. How many twodigit

primes are there between 10 and 99 which have the same property?

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since primes must end in 1,3,7,9 there are only a few decades to check.

13 and 31 , 17 and 71 , 19 and 91 , 37 and 73 , 79 and 97 .

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