Express the Sum Using Summation Notation $$a + a r + a r ^ { 2 } + \ldots + a r ^ { 14 }$$

question 50

Multiple Choice

Express the sum using summation notation. Use 1 as the lower limit of summation and i for the index of summation.
- $$a + a r + a r ^ { 2 } + \ldots + a r ^ { 14 }$$

• A) \(\sum _ { \mathrm { i } = 1 } ^ { 14 } a r ^ { \mathrm { i } }\)
• B) \(\sum _ { \mathrm { i } = 1 } ^ { 14 } ( \mathrm { ar } ) ^ { \mathrm { i } }\)
• C) \(\sum _ { i = 1 } ^ { 15 } a r ^ { i-1 } \)
• D) \(\sum _ { \mathrm { i } = 1 } ^ { 14 } ( \mathrm { ar } ) ^ { \mathrm { i } - 1 }\)

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Definitions:

Cerebral Cortex

The outer layer of neural tissue of the cerebrum in the brain, playing a key role in memory, attention, perception, cognition, awareness, thought, language, and consciousness.

Primary Somatosensory Cortex

The region of the brain responsible for processing sensory information from the body, allowing for the perception of touch, temperature, and pain.

Visual Cortex

The part of the cerebral cortex that receives and processes visual information from the eyes.

CREB

A cellular transcription factor that binds to certain DNA sequences to increase or decrease the transcription of specific genes.