Find the coefficient of:
\( x^{-15} \) in the expansion of \( \left(3 x^{2}-\frac{a}{3 x^{3}}\ri... VIDEO
Find the coefficient of:
\( x^{-15} \) in the expansion of \( \left(3 x^{2}-\frac{a}{3 x^{3}}\right)^{10} \).
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