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i^7 =______________(a) 1(b) -1(c) i(d) -iThis question was addressed to me in an online interview.My question is based upon Complex Numbers-2 in division Complex Numbers and Quadratic Equations of Mathematics – Class 11

Answer» CORRECT choice is (d) -i

Easiest explanation: We know, i = \(\sqrt{-1}\)

 => i^2 = -1 => i^4 = 1.

So, i^7 = i^4.i^3 = 1*i^2*i = (-1)*i = -i.


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