Which of the Following Are Alternating Series?
1) $\frac { ( - 1 ) ^ { 2 n } } { n }$

question 11

Multiple Choice

Which of the following are alternating series?
1) $\frac { ( - 1 ) ^ { 2 n } } { n }$
2) $\sum _ { n = 1 } ^ { \infty } \frac { ( - 1 ) ^ { n - 1 } } { n }$
3) $\sum _ { n = 1 } ^ { \infty } \frac { \cos n \pi } { n }$

• A)None
• B)1
• C)2
• D)3
• E)1, 2
• F)1, 3
• G)2, 3
• H)1, 2, 3

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