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JEE Advanced 2016 Paper 1 Mathematics Question 51

Let \(m\) be the smallest positive integer such that the coefficient of \(x^2\) in the expansion of \((1+x)^2 + (1+x)^3 + \dots + (1+x)^{49} + (1+mx)^{50}\) is \((3n+1)\ \ {}^{51}C_{3}\) for some positive integer \(n\). Then the value of \(n\) is

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