The mean of 6 different data is 12. If 5 of these data are 16, 18, 12, 13 and 8; the sixth data is :

1. 63

2. 6 × 12

3. 5

4. 12 × 3

If m × $\begin{bmatrix$}[r] 2 \ 3 \end{bmatrix} + n\begin{bmatrix}[r] -1 \ 1 \end{bmatrix} = \begin{bmatrix}[r] 10 \ 5 \end{bmatrix}, then the values of m and n are :

1. m = -3, n = -4

2. m = 3, n = -4

3. m = -3, n = 4

4. m = 3, n = 4

The next two terms of the arithmetic progression (A.P.) $\sqrt{5}, \sqrt{20}, \sqrt{45}, ……$ are :

1. 9 and $9\sqrt{5}$

2. $4\sqrt{5} \text{ and } 5\sqrt{5}$

3. $2\sqrt{5} \text{ and } 5\sqrt{5}$

4. 2 and $3\sqrt{5}$

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