Which of the Following Series Will, When Rearranged, Converge to Different

Multiple Choice

Which of the following series will, when rearranged, converge to different values?
1) $\sum _ { n = 1 } ^ { \infty } n ^ { - 1 }$
2) $\sum _ { n = 1 } ^ { \infty } ( - 1 ) ^ { n - 1 } n ^ { - 1 }$
3) $\sum _ { n = 1 } ^ { \infty } ( - 1 ) ^ { n - 1 } n ^ { - 2 }$

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