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Basic rule for determinants: for every swap of rows and or columns, multiply the determinant by -1. How many swaps do you need to go from the original matrix to the final matrix?
Expanding by a minors the swaped matrix by a last row (which a, b, c) gives same expression, and thus same answer, which is -6.
Basic rule for determinants: for every swap of rows and or columns, multiply the determinant by -1. How many swaps do you need to go from the original matrix to the final matrix?
determinent remains the same ANS is -6