Let zero = $\dfrac{p}{q}$, where p and q are integers. What additional condition will make 0 = $\dfrac{p}{q}$ a rational number :

1. q = 0

2. p ≠ 0

3. q ≠ 0

4. p ≠ 0 and q ≠ 0.

7.478478…. is a :

1. terminating rational

2. recurring

3. neither rational non-terminating

4. not real

$\dfrac{71}{75}$ is :

1. terminating

2. non-terminating

3. periodic decimal

4. not a rational number

Which of the following is terminating:

$\dfrac{13}{85}, \dfrac{51}{405} \text{ and } \dfrac{9}{524}$

1. $\dfrac{13}{85}$

2. $\dfrac{9}{524}$

3. $\dfrac{51}{405}$

4. None