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JEEMAIN and NEET
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Mathematics
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Class12
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Matrices
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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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