Write the Sum Without Sigma Notation and Evaluate It $$\sum _ { k = 1 } ^ { 3 } 5 ^k { \cos k \pi }$$

question 188

Multiple Choice

Write the sum without sigma notation and evaluate it.
- $$\sum _ { k = 1 } ^ { 3 } 5 ^k { \cos k \pi }$$

• A) \(5 \cos \pi + 25 \cos 2 \pi + 125 \cos 3 \pi = 105\)
• B) \(5 \cos \pi + 25 \cos \pi + 125 \cos \pi = - 155\)
• C) \(5 \cos \pi + 25 \cos 2 \pi + 125 \cos 3 \pi = - 105\)
• D) \(5 \cos \pi + 125 \cos 3 \pi = - 130\)

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