Express the Sum Using Summation Notation $a + a r + a r ^ { 2 } + \ldots + a r ^ { 10 }$

Multiple Choice

Express the sum using summation notation. Use 1 as the lower limit of summation and i for the index of summation.
- $a + a r + a r ^ { 2 } + \ldots + a r ^ { 10 }$

A) $\sum _ { i = 1 } ^ { 10 } a r ^ { i }$
B) $\sum _ { \mathrm { i } = 1 } ^ { 10 } \left( \mathrm { ar } ^ { \mathrm { i } } - 1 \right.$
C) $\sum _ { i = 1 } ^ { 11 } a r ^ { i - 1 }$
D) $\sum _ { i = 1 } ^ { 10 } ( a r ) ^ { i }$