Math question: "What is the value of x when solving the equation x^n + y^n = z^n, where n > 2, x, y, and z are positive integers, and no solution exists?"
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Math question: Calculate the standard deviation of the following data set - {4, 9, 12, 16, 20}.
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What is the limit of (5x^2 - 3x + 2) as x approaches 2?