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If A=[(a,b),(0,a)] is nth root of I(2), ...

If `A=[(a,b),(0,a)]` is nth root of `I_(2)`, then choose the correct statements :
(i) if n is odd, a=1, b=0
(ii) if n is odd, a=-1, b=0
(iii) if n is even, a=1, b=0
(iv) if n is even, a=-1, b=0

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