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Question

If n ∈ , then find the value of in+in+1+in+2+in+3.

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Solution

in+in+1+in+2+in+3=in+in.i+in.i2+in.i3=in+in.i+in.(-1)+in.(-i)=in+in.i-in-in.i=0

Thus, the value of in+in+1+in+2+in+3 is 0.

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