If matrix P = $\begin{bmatrix$}[r] -2 & 0 \ 4 & -3 \end{bmatrix}, then P² is :

1. $\begin{bmatrix$}[r] 4 & 0 \ -20 & 9 \end{bmatrix}

2. $\begin{bmatrix$}[r] 4 & 0 \ -20 & -9 \end{bmatrix}

3. $\begin{bmatrix$}[r] -4 & 0 \ -20 & 9 \end{bmatrix}

4. $\begin{bmatrix$}[r] 4 & 0 \ 20 & -9 \end{bmatrix}

Point P divides join of points A = (0, -5) and B = (10, -5) internally in the ratio 3 : 2 such that the point P is nearer to point A. The co-ordinates of point P are :

1. (4, 0)

2. (0, -5)

3. (-4, -5)

4. (4, -5)

The sum of three consecutive terms in A.P. is 48, then the middle term is :

1. 16

2. 12

3. 15

4. 18

The mean height of 9 students is 1.6 m. If one more student of height 1.56 m joins, the mean height of resulting number of students is :

1. 1.50 m

2. 1.956 m

3. 1.93 m

4. 1.596 m