In mathematics, how many distinct four-letter arrangements can be formed from the letters of the word 'ROMA' without repetition?

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In mathematics, what is the derivative of the rational function $f (x) = \frac{2 x - 1}{x + 3}$ with respect to $x$ ?
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In mathematics, which function represents the general solution of the first-order differential equation $y^{'} - 2 x y = x$ ?
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In mathematics, what are the coordinates of the inflection point of the cubic curve $y = x^{3} - 3 x^{2} + 4$ ?