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Express the Sum Using Summation Notation $\sum _ { k = 1 } ^ { 6 } ( - k )$

Question 6

Multiple Choice

Express the sum using summation notation.
- $\sum _ { k = 1 } ^ { 6 } ( - k )$

A) $- 5$
B) $- 30$
C) $- 6$
D) $- 21$

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