The third term of a G.P. is 3. The product of its first five terms is :

1. 15

2. $\dfrac{3 \times 5}{2}$

3. 3⁵

4. 5³

Let first five terms of G.P. be

$\dfrac{a}{r^2}, \dfrac{a}{r}, a, ar, ar^2$

Given,

3rd term of G.P. is 3.

∴ a = 3

Product of first five terms are

$\Rightarrow \dfrac{a}{r^2} \times \dfrac{a}{r} \times a \times ar \times ar^2 \\[1em] \Rightarrow a^5 \\[1em] \Rightarrow 3^5.$

Hence, Option 3 is the correct option.