Question

If $\frac{5z_2}{7z_1}$ is a purely imaginary number, then $\left|\frac{2z_1+3z_2}{2z_1-3z_2}\right|$ is equal to

• A. $\frac{5}{7}$
• B. $\frac{7}{5}$
• C. 1
• D. none of these

Answer 1

Answer: (D)

none of these

Answer 2

Answer (d) none of these