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Mathematics 17 Online
OpenStudy (anonymous):

A teacher posted this to a class: There is a prime number between 4 and 50, about which i will answer three yes or no questions. After I have given the answers to your questions, toy should not be able to determine the number. The class asked Is it more than a multiple of 3? Is it 1, 2, or 3 more than a perfect square? Is the sum of its digits odd? The answers were yes, no and yes. What is the number?

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