Question

The complex numbers $z_1$ and $z_2$ are such that $z_1\ne z_2$ and $\left|z_1\right|=\left|z_2\right|$. If $z_1$ has positive real part and $z_2$ has negative imaginary part, then $\left(\frac{z_1+z_2}{z_1-z_2}\right)$ may be

• A. zero
• B. real and positive
• C. real and negative
• D. purely imaginary

Answer 1

Answer: (A), (B)

The correct options are
A zero
B real and positive