If a = b, then ab ÷ ba is equal to :

1. 0

2. 9(a - b)

3. 11(a + b)

4. none of these

If a > b, then for two 3-digit numbers abc and cba; we have abc - cba equal to :

1. -27

2. -6

3. 6

4. none of these

Without actual calculation, the quotient, when the sum of 59 and 95 is divided by 11, is :

1. 14

2. 9

3. 95 – 59

4. none of these

Without actual calculation, the quotient when 74 – 47 is divided by 9, is :

1. 11

2. 7

3. 3

4. none of these