Geometric sigma notation help..... points
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Geometric sigma notation help..... points

[From: ] [author: ] [Date: 12-08-02] [Hit: ]
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Find the indicated sum:

http://webwork.math.ttu.edu/wwtmp/equati…

=_________

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we have 4(1/3)^n

starting with n=1 till n=13 we have a geometric series with a₁=1/3 and r=1/3

Sn = a₁(q^n -1) / q-1

S13 = (1/3)*((1/3)^13 -1) / 1/3 -1 ≈0.5

because originally we had 4(1/3)^n then: 4(0.5) = 2

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