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The General Term of a Sequence Is Given $a _ { n } = ( - 1 ) ^ { n } ( 2 n ) ; s _ { 4 }$

Question 133

Multiple Choice

The general term of a sequence is given. Find the indicated partial sum.
- $a _ { n } = ( - 1 ) ^ { n } ( 2 n ) ; s _ { 4 }$

A) 20
B) 16
C) -20
D) 4

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