Word Count : 196

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To test the convergence of the given series: \[ S = \frac{3}{5 \cdot 9 \cdot 7}X + \frac{5}{10 \cdot 12 \cdot 11}X^2 + \frac{7}{15 \cdot 15 \cdot 15}X^3 + \frac{9}{20 \cdot 18 _________ ________ ____ _______ ______ ______ _____ _________ ____ ____.
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