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Question

If (1+i1i)x=1, then

A
x = 4n, where n is any positive integer
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B
x = 2n, where n is any positive integer
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C
x = 4n + 1, where n is any positive integer
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D
x = 2n + 1, where n is any positive integer
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Solution

The correct option is A x = 4n, where n is any positive integer

(1+i1i)x=1[(1+i)21i2]x=1,
[(1+i2+2i1+1]x=1 ix=1
x=4n,nEI+.


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