For positive integers the value of the expression (1+i)n1+(1+i3)n1+(1+ – InterviewSolution

1.	For positive integers the value of the expression (1+i)n1+(1+i3)n1+(1+i5)n2+(1+i7)n2where i=√−1is a real number if and only if
Answer» For positive integers the value of the expression $(1 + i)^{n_{1}} + (1 + i^{3})^{n_{1}} + (1 + i^{5})^{n_{2}} + (1 + i^{7})^{n_{2}}$ where $i = \sqrt{- 1}$ is a real number if and only if

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