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If z1 and z2 be complex numbers such that z1 6= z2 and jz1j = jz2j. If z1 has positive real part and z2 has negative imaginary part, then (z1 + z2) (z1-z2) may be A) Purely imaginary B) Real and positive C) Real and negative D) None of these
Dear student In the above i want to mention that Numerator is purely imaginary whereas denominator is purely real.Note: Im(z) and Re(z) are real numbers.So, it is imaginary.
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