1.

The coefficient of x12 in the expansion of \(\left(3x^2 + \frac 1 x\right)^{30}\) is:

A. \(\left( {\begin{array}{*{20}{c}} {30}\\ C\\ {15} \end{array}} \right){3^{15}}\)
B. \(\left( {\begin{array}{*{20}{c}} {30}\\ C\\ {10} \end{array}} \right){3^{12}}\)
C. \(\left( {\begin{array}{*{20}{c}} {30}\\ C\\ {12} \end{array}} \right){3^{12}}\)
D. \(\left( {\begin{array}{*{20}{c}} {30}\\ C\\ {16} \end{array}} \right){3^{14}}\)
Answer» E.


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