Q18. If the complex number (z-1)/(z+1) is purely imaginary, where z ≠ -1, then which of the following must be true?Mathematics — NUST Mock By IBAGRADS 4 — Question 18 of 200A. |z| = ½B. |z| = 1C. |z| = 2D. |z| = 3Practice more Mathematics MCQs for entrance exam preparation on Examora.io.← Previous Question Next Question →