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If $A$ be a real skew- symmetric matrix of order $\mathrm{n}$ such that $A^{2}+I=0$, I being the identity matrix of the same order as that of $A$, then what is the order of $A$?
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The correct answer is:
3
We know if $A$ is a real skew-symmetric matrix of order $n$ such that $A^{2}+I=0$, then order of $A$ is 3.
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