Evaluate the determinant of the following matrices by any legitimate method.
( 1 2 3 ) (-1 3 2 ) ( 0 1 1 )
(a) ( 4 5 6 ), (b) ( 4 -8 1 ), (c) ( 1 2 -5 )
( 1 2 3 ) ( 2 2 5 ) ( 6 -4 3 )