+1 vote
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The number of terms independent of $x$ in the binomial expansion of $\left(3x^2 + \dfrac{1}{x}\right)^{10}$ is

1. $0$
2. $1$
3. $2$
4. $5$

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+1 vote

let mth  term is independent of x (here m is integer)

(3x2)m x ($\frac{1}{x}$)10-m

x2m-10+m

2m-10+m=0

m=10/3 not integer

Anser  : A

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