If `|z-2+i|le2,` find the greatest and least value of|z|, where `i=sqrt(-1).`

1. If |z-2+i|≤ 2 then find the greatest and least value of | z|

Find the general value of log_(2)(5i), where i=sqrt(-1).

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If |z+(4)/(z)|=2, find the maximum and minimum values of |z|.

Find he value of sum_(r=1)^(4n+7)\ i^r where, i=sqrt(- 1).

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If |z-2i|lesqrt(2), where i=sqrt(-1), then the maximum value of |3-i(z-1)|, is