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Questions  >>  JEEMAIN and NEET  >>  Mathematics  >>  Class12  >>  Matrices
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Q)

If $A=\begin{bmatrix}1&2&2\\2&1&2\\2&2&1\end{bmatrix}$ then $A^2-4A$ is equal to

$(a)\;2I_3\qquad(b)\;3I_3\qquad(c)\;4I_3\qquad(d)\;5I_3$

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