Question

What is the sum of this infinite geometric series?

∞
E (12)(0.5)^i
i=1

Answer 1

\[\sum_{i=0}^{\infty}12\cdot 0.5^i\]

Answer 2

http://www.regentsprep.org/regents/math/algtrig/atp2/geoseq.htm

Answer 3

see this video
http://www.khanacademy.org/math/calculus/sequences_series_approx_calc/seq_series_review/v/deriving-geometric-series-sum-formula

some of the earlier videos give the intro to geometric series. These might be useful if this stuff is confusing.