If $$i = \sqrt { - 1} $$ and n is positive integer, then $${i^n} + {i^{n + 1}} + {i^{n + 2}} + {i^{n + 3}}$$ is equal to

The modulus of $${{1 - i} \over {3 + i}} + {{4i} \over 5}$$ is

For any complex number z, the minimum value of $$|z| + |z - 1|$$ is

If $$z = {4 \over {1 - i}}$$, then $$\overline z $$ is (where $$\overline z $$ is complex conjugate of z)