For what values of x are the numbers $-\dfrac{2}{7}, x, -\dfrac{7}{2}$ in G.P.?

1. 0, 1

2. 0, −1

3. −1, 1

4. −2, 2

How many terms of the G.P. 1, 4, 16, 64, …….. will make the sum 5461?

1. 6

2. 9

3. 7

4. 8

The sum of the first two terms of a G.P. is −4 and the fifth term is 4 times the third term. Then, the first term of the G.P. is :

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

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

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

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

If x, y and z are in G.P., then the relation between x, y and z can be :

1. y = x + z

2. y = xz

3. 2y = x + z

4. $y = \sqrt{xz}$