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The determinant of an orthogonal matrix is

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The value of the determinant
n p m
p m n
m n p 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