$\dfrac{103^2 - 97^2}{200}$ is equal to

1. 3

2. 4

3. 5

4. 6

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

1. 121

2. 73

3. 48

4. 169

If $\dfrac{x}{y} + \dfrac{y}{x}$ = -1 (x, y ≠ 0) then the value of x³ - y³ is

1. 1

2. -1

3. 0

4. $\dfrac{1}{2}$

If a + b + c = 0, then the value of a³ + b³ + c³ is

1. 0

2. abc

3. 2abc

4. 3abc