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For a number to have exactly 3 factors it must be a square of a prime. Because, if p is a prime, then 1, p and p^2 are the only factors of p^2. Now 3^2 = 9 is too small 5^2 = 25 meets the requirements and 7^2 = 49 is too large. So the answer is 25.

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Q: Luke has chosen a number his number is greater than 12 and least than 40 and it has exactly three factor what might his number be?
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