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If A=[(1 ,0, 0),(0, 1,0),( a,b, -1)] , ...

If `A`=`[(1 ,0, 0),(0, 1,0),( a,b, -1)]` , then `A^2` is equal to (a) a null matrix (b) a unit matrix (c) ` A` (d) `A`

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