The 10th term of the G.P. 1, −a, a², −a³, …….. is :

1. a⁹

2. −a¹⁰

3. −a¹¹

4. −a⁹

The first term and the common ratio of the G.P. 3, $\dfrac{3}{2}, \dfrac{3}{4}$, ………. are respectively :

1. 3 and 2

2. 3 and $\dfrac{1}{2}$

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

4. $\dfrac{3}{2}$ and $\dfrac{1}{2}$

If the 5th term of a G.P. is 2, then the product of its first nine terms is :

1. 256

2. 1024

3. 512

4. 2048

If the (p + q)th and (p − q)th term of a G.P. are m and n respectively, then its pth term is :

1. mn

2. $\sqrt{mn}$

3. (mn)²

4. $\dfrac{m}{n}$