If A and b are square matrices of order 3 such that $|A|= -1, |B|=3, $ then $|3\, AB|$ equals
Answer & explanation
Correct answer: option 1
The correct answer is option (1) : -9
We have, $|A|= -1, |B|= 3$
$∴|3\, AB|= 3 |A||B|=3×-1×3=-9$
If A and b are square matrices of order 3 such that $|A|= -1, |B|=3, $ then $|3\, AB|$ equals
Correct answer: option 1
The correct answer is option (1) : -9
We have, $|A|= -1, |B|= 3$
$∴|3\, AB|= 3 |A||B|=3×-1×3=-9$