If $\;(2 + \large\frac{x}{3})^{55}\;$ is expanded in the ascending powers of x in two consecutive terms of the expansion are equal , then these terms are :

Question

$(a)\;7^{th}\;and\;8^{th} \qquad(b)\;8^{th}\;and\;9^{th}\qquad(c)\;28^{th}\;and\;29^{th}\qquad(d)\;27^{th}\;and\;28^{th}$