If A = \(\begin{bmatrix}3 & 4\\6 &am

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Target Exam

CUET

Subject

-- Mathematics - Section B1

Chapter

Determinants

Question:

If A = $\begin{bmatrix}3 & 4\\6 & 8 \end{bmatrix}$ , then what can be said about 18 ${ A }^{ -1 }$ ?

Options:

18 ${ A }^{ -1 }$ = 9 (adj A)

18 ${ A }^{ -1 }$ = 2 (adj A)

18 ${ A }^{ -1 }$ = 18 (adj A)

None of these

Correct Answer:

None of these

Explanation:

A = $\begin{bmatrix}3 & 4\\6 & 8 \end{bmatrix}$ ,

|A| = 0

So, ${ A }^{ -1 }$ does not exist