Answer is (a) i.e. 8
|2A| = k|A|
Since the order of matrix is 3
2^3|A| = 8|A|
K = 8
(When we say that 2 is being multiplied by matrix A , it is multiplied by each row. In a determinant we take common 2 from Row 1 , Row 2 and Row 3. So we get 2*2*2 out of the determinant)
:)
