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[" 15.Let "z in C" with "lm(z)=10" and i...

[" 15.Let "z in C" with "lm(z)=10" and it satisfies "(2z-n)/(2z+n)=2i-1" for some natural number "n" .Then "],[[" (A) "n=20" and "Re(z)=-10," (B) "n=20" and "Re(z)=10],[" (C) "n=40" and "Re(z)=-10," (D) "n=40" and "Re(z)=10]]

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