Question

If any two columns of a determinant are interchanged

Answer 1

negative sign come out of determinant

Answer 2

Elementary row (column) operations of determinanti) Interchange of two rows (or column) multiplies the value of the determinant by -1 (P2)ii) A common factor of all elements of any row (or column) can be placed before the determinant. (P3)iii) Addition of a multiple of a row (column) to another row (column) does not alter the value of the determinant (P4)