For two matrices A and B both of the same order, which of the following is always true :

1. (A + B)² = A² + 2AB + B²

2. (A - B)² = A² - 2AB + B²

3. A × B = B × A

4. A × (B + A) = A × B + A²

If the points (0, 0), (1, 2) and (x, y) are collinear, then :

1. x = y

2. 2y = x

3. 2x = y

4. y = -x

A dealer (in the inter-state sale) sells goods worth ₹ 15,000. If the rate of GST is 12%, then the central GST share is :

1. ₹ 1,800

2. ₹ 16,800

3. ₹ 0

4. ₹ 15,900

Value of m for which quadratic equation 2x² - mx + m = 0 has equal roots, is :

1. 4

2. 8

3. -4

4. -8