Express the Sum Using Summation Notation $$\sum _ { k = 1 } ^ { 4 } ( - 1 ) ^ { k } \cdot 2 k$$

question 1

Multiple Choice

Express the sum using summation notation.
- $$\sum _ { k = 1 } ^ { 4 } ( - 1 ) ^ { k } \cdot 2 k$$

• A) \(- 20\)
• B) 20
• C) 16
• D) 4

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