I'm sorry if this is duplicated, but I can not find any answer to it.
Answer
the geometric series for |x|<1
1+x+x2+x3+....=11−x
use x=0.5
1+12+122+123+...=11−12=2
How to find lim without lhopital rule? I know when I use lhopital I easy get $$ \lim_{h\rightarrow 0}...
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