The common ratio of the G.P. $-\dfrac{3}{4}, \dfrac{1}{2}, -\dfrac{1}{3}, \dfrac{2}{9}, \dots$ is :

1. $-\dfrac{4}{3}$

2. $-\dfrac{2}{3}$

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

4. $-\dfrac{3}{8}$

The common ratio of the G.P. $\dfrac{1}{a^3x^3},\ ax,\ a^5x^5,\ \dots$ is :

1. $\dfrac{1}{a^2x^2}$

2. $\dfrac{1}{a^4x^4}$

3. a²x²

4. a⁴x⁴

The 8th term of the G.P. 1, 3, 9, 27, ………. is :

1. 729

2. 2187

3. 6561

4. none of these

The nth term of the G.P. x³, x⁵, x⁷, …….. is :

1. x^{(2n - 1)}

2. x^{(2n + 3)}

3. x^{(2n + 1)}

4. x^{3n + 2}