Editor
Which of the following series converges?
Difficulty: Easy
A: 
$S=-1-1-1- \space...$
B: 
$S=1+\frac{1}{2}+\frac{1}{4} + \space...$
C: 
$S=1+1+1+ \space...$
D: 
$S=2+4+8+ \space...$
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