Express the sum using summation notation.
-$$\sum _ { k = 1 } ^ { 4 } ( - 1 ) ^ { k } \cdot 2 k$$
A) $- 20$
B) 20
C) 16
D) 4

Name: 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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Question

Quizplus · Accepted Answer

The given expression is a summation notation, not a specific numerical value, so none of the numerical options (A, B, C) are correct. The correct answer is D, which is a non-numerical option and is chosen by process of elimination.

Express the Sum Using Summation Notation ∑k=14(−1)k⋅2k\sum _ { k = 1 } ^ { 4 } ( - 1 ) ^ { k } \cdot 2 kk=1∑4​(−1)k⋅2k

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