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If matrix A=([a(i j)])(2xx2) , where a(i...

If matrix `A=([a_(i j)])_(2xx2)` , where `a_(i j)={1,\ if\ i!=j0,\ if\ i+j` , then `A^2` is equal to `I` (b) `A` (c) `O` (d) ` I`

A

I

B

A

C

O

D

`-I`

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A
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