If x is a positive integer and 15 - 2(2x - 1) < 15, the solution set is :

1. {-2, -1}

2. {1, 2, 3, 4, 5, ……}

3. {0, 1, 2, 3, 4, ……}

4. {1, 2, 3, 4, 5, 6}

In the adjoining figure, O is the center of the circle. If angle BOC = 140°, the value of x is :

1. 70°

2. 30°

3. 40°

4. 20°

The centroid of triangle ABC is G = (6, -3). If A = (-6, -3), B = (x, 6) and C = (9, y), then the values of x and y are :

1. x = 6, y = 15

2. x = 15, y = -12

3. x = 15, y = 6

4. x = -15, y = 6