If the points (0, 0), (1, 2) and (x, y) are collinear, then :

1. x = y

2. 2y = x

3. 2x = y

4. y = -x

Value of m for which quadratic equation 2x² - mx + m = 0 has equal roots, is :

1. 4

2. 8

3. -4

4. -8

The n^th term of an A.P. is 2n - 5, then the sum of its first 6 term is :

1. 12

2. 15

3. -48

4. -12