The matrix $$A=0$$ $$0$$ −$$70$$ −$$7$$ $$0$$−$$7$$ $$0$$ $$0$$ is a

Correct option is 4non-singular

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The matrix $A = [\begin{array}{rrr} 0 0 - 7 \\ 0 - 7 0 \\ - 7 0 0 \end{array}]$ is a

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Correct option is D

Note that A2=49I⇒ A−1=149A [∴ A is non-singular]

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The matrix A=0 0 −70 −7 0−7 0 0 is a

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The matrix $A = [\begin{array}{rrr} 0 0 - 7 \\ 0 - 7 0 \\ - 7 0 0 \end{array}]$ is a