For

$\begin{matrix} & 1 & 2 & \text{A} \ - & & \text{A} & 9 \ \hline & & 4 & 8 \ \hline \end{matrix}$

the value of digit A is :

1. 6

2. 7

3. -1

4. none of these

Find the quotient, when the sum of 94 and 49 is divided by :

(a) 11

(b) 13

If a = b, show that abc = bac.

Write the quotient when the difference between 694 and number obtained on interchanging its ones and hundreds digits is divided by :

(i) 33

(ii) 99

(iii) 2