What is the variance of the set {4, 7, 9, 12, 15}?
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Question: Find the sum of the mixed numbers 3 1/2, 2 3/4, and 1 2/3. Factor the result and list all the factors. Finally, determine if any of these factors are real numbers.
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Math question: What is the smallest positive integer value of n for Fermat's theorem equation a^n + b^n = c^n, where a ≠ b ≠ c, satisfying n > 2?