Q 2319691519.     If `A` is a real skew-symmetric matrix of order `n`
such that `A^2 + I = 0`, where `I` being the identity
matrix of the same order as that of `A`, then what is
the order of `A`?

NDA 2010 Paper 1 April
A

3

B

Odd

C

Prime number

D

None of these

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