Let A = [ 200 50 10 2 ] and B = [ 50 40 2 3 ] , then | A B | is equal to:

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Solution

Q.
Let $A = [\begin{matrix} 200 & 50 \\ 10 & 2 \end{matrix}]$ and $B = [\begin{matrix} 50 & 40 \\ 2 & 3 \end{matrix}],$ then $| A B |$ is equal to:

1 460

2 2000

3 3000

4 - 7000

Ans.
(4)

Ans. -7000

Explanation:

$| A B |$ $=$ $| A |$ $| B |$ $= (400 - 500) (150 - 80)$

$= (- 100) (70) = - 7000$

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