If the sum of three numbers in A.P. is 48; then the middle term is :

1. 16

2. 18

3. 12

4. 6

The point P(-6, -3) is reflected in line y + 3 = 0 to point P'. The co-ordinates of point P' are :

1. (-6, 3)

2. (-6, -3)

3. (6, 3)

4. (6, -3)