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B
3
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C
−4
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D
1
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Solution
The correct options are A4 C−4 ∵1+i1−i=1+i1−i×1+i1+i =(1+i)21−i2=1+2i+i21−i2 =1+2i−11+1=i ∴(1+i1−i)n=1 ⇒in=1 Thus, in will be positive integer, if n=4.