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If A and B are square matrices of order 3 such that `absA=-1,absB=3," then "abs(3AB)` equals

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If A and B are square matrices of order 3 such that `absA=-1,absB=3," then "abs(3AB)` equals
A. `-9`
B. `-81`
C. `-27`
D. 81
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Correct Answer - A
We have, `|A| = -1, |B| =3`
`:. |3AB| = 3| A|| B| = 3xx -1 xx 3 = -9`
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