The coefficient of x18 in the expansion of x2-3a-x 15 is

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Binomial Coefficients

The coefficie...

Question

The coefficient of $x^{18}$ in the expansion of ${(x^{2} + \frac{3 a}{x})}^{15}$ is

110565 a^{4}

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101565 a^{3}

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110556 a^{4}

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110655 a^{4}

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