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AP EAMCET202420 May 2024Evening ShiftMathematicsComplex NumberActual

If 3-2 i 1+2 i is purely imaginary number, then =

Options

  1. A2 n 4
  2. B2 n 2
  3. Cn 3
  4. Dn 6

Correct answer

C. n 3

Step-by-step solution

3-2 i 1+2 i = (3-2 i )(1-2 i ) 1+4 ^2 = 3-4 ^2 1+4 ^2 From the given information real part =0 ^2 = 3 4 =n 3

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