The sum of the squares of two numbers is 13 and their product is 6. Find :

(i) the sum of the two numbers.

(ii) the difference between them.

(x + y)(x - y)(x² + y²)(x⁴ + y⁴) is equal to:

1. x⁴ + y⁴

2. x⁸ + y⁸

3. x⁸ - y⁸

4. 2x⁶y⁶

The value of 102 x 98 is:

1. 6999

2. 6696

3. 9696

4. 9996