Matrices and determinants

If A is 2 x 3 and B is 3 x 4, the order of AB is:

• 1 AB is not defined
• 2 4 x 2
• 3 3 x 3
• 4 2 x 4

The determinant of [[1, 2], [3, 4]] is:

• 1 -10
• 2 2
• 3 10
• 4 -2

The inverse of a matrix A exists only if:

• 1 det A is zero
• 2 A is a row matrix
• 3 det A is not zero
• 4 A is 3 x 2

If A is a 3 x 3 matrix and det A = 2, then det(2A) is:

• 1 8
• 2 6
• 3 4
• 4 16

The transpose of the transpose of A is:

• 1 A
• 2 Zero
• 3 Identity
• 4 The inverse of A