Engineering Mathematics Linear Algebra Matrix Algebra

A is a scalar matrix with scalar k ≠ 0 of order 3. Then A-1 is

1
\(\frac{1}{{{k^2}}}{\rm{I}}\)
2
\(\frac{1}{{{k^3}}}{\rm{I}}\)
3
\(\frac{1}{k}{\rm{I}}\)
4
\(kI\)

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