NDA Government Jobs Exams

If D is a determinant of order 3 and D' is the determinant obtained by replacing the elements of D by their
cofactors, then which one of the following is correct ?
(a) D ' = D^2
(b) D' = D^3
(c) D' = 3D^2
(d) D' = 3D^3

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NDA Other Question

The determinant of an orthogonal matrix is Consider the following statements:
1. A matrix is not a number
2. Two determinants of different orders may have the same value.
Which of the above statements is/are correct ?
(a) 1 only (b) 2 only (c) Both 1 and 2 (d) Neither 1 nor 2