For the quadratic equation ax² + bx + c = 0, we have b² > 4ac, then the roots of the equation are :

1. equal

2. 0 each

3. real and unequal

4. real and equal

A shopkeeper buys goods worth ₹ 4000 and sells at profit of 8%. If the rate of GST is 5%, then the bill amount is :

1. ₹ 4020

2. ₹ 4320

3. ₹ 4536

4. ₹ 3864

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