Question:medium
The coefficient of $\dfrac{1}{x^2}$ in the binomial expansion of $\left(3x - \dfrac{1}{3x}\right)^4$ is:
The coefficient of $\dfrac{1}{x^2}$ in the binomial expansion of $\left(3x - \dfrac{1}{3x}\right)^4$ is:
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Always equate powers of $x$ in general term to find required coefficient.
Updated On: Apr 24, 2026
- $\frac{4}{7}$
- $\frac{3}{8}$
- $\frac{2}{9}$
- $\frac{4}{9}$
- $-\frac{4}{9}$
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The Correct Option is
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