Write the Series in Summation Notation $$z ^ { 5 } + z ^ { 10 } + z ^ { 15 } + z ^ { 20 } + z ^ { 25 }$$

Multiple Choice

Write the series in summation notation. $$z ^ { 5 } + z ^ { 10 } + z ^ { 15 } + z ^ { 20 } + z ^ { 25 }$$

A) $\sum _ { j = 1 } ^ { 5 } z ^ { 5 j }$
B) $\sum _ { j = 5 } ^ { 25 } z ^ { j }$
C) $\sum _ { j = 5 } ^ { 9 } z ^ { j }$
D) $\sum _ { j = 1 } ^ { 25 } z ^ { 5 j }$