31. Let z=a+i+a−i1, where a is a real number. Which of the following must be true? I. z is a real number. II. If z is a
Posted: Wed Jul 13, 2022 5:08 am
31. Let z=a+i+a−i1, where a is a real number. Which of the following must be true? I. z is a real number. II. If z is a purely imaginary number, then z=2i. III. Imaginary part of z Real part of z is an irrational number. A. I only B. II only C. I and III only D. II and III only