Question: Let $z \in C$ with $\operatorname{Im}(z)=10$ and it satisfies $\frac{2 z-n}{2 z+n}=2 i-1$ for some natural number $n$. Then:
$\mathrm{n}=20$ and $\operatorname{Re}(\mathrm{z})=-10$
$\mathrm{n}=20$ and $\operatorname{Re}(\mathrm{z})=10$
$\mathrm{n}=40$ and $\operatorname{Re}(\mathrm{z})=-10$
$\mathrm{n}=40$ and $\operatorname{Re}(\mathrm{z})=10$
Correct Option: , 3
Solution:
