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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

The determinant of the identity matrix of order 3 is:

• 1 3
• 2 -1
• 3 1
• 4 0

The product AB of matrices A and B is defined only if:

• 1 B is square
• 2 Columns of A = rows of B
• 3 A is square
• 4 Rows of A = rows of B

A square matrix with zeros below the main diagonal is:

• 1 Lower triangular
• 2 Diagonal only
• 3 Upper triangular
• 4 Symmetric