Write the Sum Using Summation Notation $$a + a r + a r ^ { 2 } + a r ^ { 3 } + \ldots + a r ^ { 19 }$$

question 63

Multiple Choice

Write the sum using summation notation.
- $$a + a r + a r ^ { 2 } + a r ^ { 3 } + \ldots + a r ^ { 19 }$$

• A) \(\sum _ { i = 1 } ^ { 19 } a r ^ { j - 1 }\)
• B) \(\sum _ { i = 1 } ^ { 20 } a r ^ { i - 1 }\)
• C) \(\sum _ { i = 1 } ^ { 19 } a r ^ { i }\)
• D) \(\sum _ { i = 1 } ^ { 20 } a r ^ { i }\)

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