If I₃ denotes identity matrix of order 3 × 3, write the value of its determinant.

If A = [a_ij] is a 3 × 3 diagonal matrix such that a₁₁ = 1, a₂₂ = 2 and a₃₃ = 3, then find |A|.

If A = [a_ij] is a 3 × 3 scalar matrix such that a₁₁ = 2, then write the value of |A|.

A matrix A of order 3 × 3 has determinant 5. What is the value of |3A|?

On expanding by first row, the value of the determinant of 3 × 3 square matrix A = [a_ij] is a₁₁C₁₁ + a₁₂C₁₂ + a₁₃C₁₃, where C_ij is the cofactor of a_ij is the cofactor of a_ij in A. Write the expression for its value of expanding by second column.