For \( m \in N \), if the sum of coefficients of first, second and third terms in the expansion ...

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For \( m \in N \), if the sum of coefficients of first, second and third terms in the expansion of \( \left(x^{2}+\frac{1}{x}\right)^{m} \)
\( P \) is 46 , then the coefficient of term which does not contain \( \mathrm{x} \) is

W
(A) 84
(B) 75
(C) 68
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