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If the sum of the coefficients of $1^{st},\:2^{nd}$ and $3^{rd}$ terms in the expansion of $(x^2+\large\frac{1}{x})$$^n $ is $46$, then the coefficient of the term independent of $x$ = ?

$\begin{array}{1 1} 106 \\ 92 \\ 98 \\ 84 \end{array} $

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