If a matrix A is of order 5 × 3 and matrix B is of order 2 × 5; then order of matrix BA is :

1. 5 × 2

2. 2 × 3

3. 5 × 5

4. 5 × 3

The point P(m, n) is first reflected in x-axis to point P' and then point P' is reflected in y-axis to point P". Then the single transformation that reflects point P to P" is :

1. reflection in x-axis

2. reflection in y-axis

3. reflection in origin

4. invariant

△ABC and △PQR are similar to each other. If ∠A = 45° and ∠R = 55°; then angle B is equal to :

1. 55°

2. 80°

3. 100°

4. 90°

On dividing x³ + 4x² + 5x + 6 by x, the remainder is :

1. 16

2. 6

3. -5

4. 5