If $${\mathop{\rm Re}\nolimits} \left( {{{z - 1} \over {z + 1}}} \right) = 0$$, where z = x + iy is a complex number, then which one of the following is correct?

If $$z = {\left( {{{\sqrt 3 } \over 2} + {i \over 2}} \right)^{107}} + {\left( {{{\sqrt 3 } \over 2} - {i \over 2}} \right)^{107}}$$, then what is the imaginary part of z equal to?

What is the number of distinct solutions of the equation $${z^2} + |z|\, = \,0$$ (where, z is the complex number)?

Read the following information carefully and answer the questions given below.

Let z₁, z₂ and z₃ be non-zero complex numbers satisfying $${z^2} = i\overline z $$, where $$i = \sqrt { - 1} $$

What is z₁ + z₂ + z₃ equal to?