(102)² - (98)² is equal to

1. 200

2. 400

3. 600

4. 800

96 × 104 is equal to

1. 9984

2. 9974

3. 9964

4. none of these

If x + y = 11 and xy = 24, then x² + y² is equal to

1. 121

2. 73

3. 48

4. 169

The value of 249² - 248² is

1. 1²

2. 477

3. 487

4. 497