The 4^th term of a G.P. is 16 and the 7^th term is 128, then its common ratio is equal to :

1. 2

2. -2

3. 1

4. -1

(2x + 2) and (3x + 3) are two consecutive terms of a G.P. The common ratio of the G.P. is :

1. 2

2. 3

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

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

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

The 8^th term of a G.P. is 192 and its common ratio is 2, then the first term of the G.P. is :

1. 3

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

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

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