The value of determinant of a(1x1) matrix [a] is defined as |a| = 1

Value of determinant of order 2 is defined as

Value of determinant of order 3 or more is determined by finding minor of aij in |a| and co-factor in aij in |a|.

**Minor of aij in |a|** is defined as the value of the determinant obtained by deleting the i^{th} row and j^{th} column of |A| and is denoted by **Mij**.

**Co-factor of aij in |A| **is defined as

Similarly, we can obtain the minor of each one of the remaining elements.

Now if we denote the co-factor of aij by cij, then,

C11 = (-1)^{1+1}. M11 = (a22a33 – a32a23);

C12 = (-1)^{1+2}. M12 = -M12 = (a31a23 – a21a33)

C13 = (-1)^{1+3}. M13 = M13 = (a21a32 – a31a22)

C21 = (-1)^{2+1}. M21 = - M21 = (a32a13 – a12a33)

Similarly, the co-factor of each one of the remaining elements of ∆ can be obtained.

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