Question

Let m and n be the coefficient of $7^{th}$ and $13^{th}$ term in expansion of $\bigg(\frac{1}{3x^{\frac{1}{3}}} +\frac{1}{2x^{\frac{2}{5}}}\bigg)^{18}$, then $\bigg(\frac{m}{n}\bigg)^{\frac{1}{3}}$ is:

• A. $\frac{1}{4}$
• B. $\frac{4}{7}$
• C. $\frac{1}{9}$
• D. $\frac{4}{9}$

Answer 1

Answer: (D)

$\frac{4}{9}$

Answer 2

The Correct Option is (D): $\frac{4}{9}$