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प्रश्न
If A and B are square matrices of order 3 × 3 and |A| = –1, |B| = 3, then |3AB| equals ______.
पर्याय
81
–81
–27
–9
MCQ
रिकाम्या जागा भरा
उत्तर
If A and B are square matrices of order 3 × 3 and |A| = –1, |B| = 3, then |3AB| equals –81.
Explanation:
|3AB| = 27|AB|
= 27|A||B|
= 27(–1) × 3
= –81
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