1r. R code for the sum of a geometric series.

r can NOT equal 1 using the formula, but here the R code just returns a*n.

In a Geometric Sequence each term is found by multiplying the previous term by a constant.

example call: geomsum(1,2,5) #sum {1,2,4,8,16}

geomsum(a,r,n) where

a = (the first term)

r = (the "common ratio")

n = number of terms to sum

2r. R code for a List and the sum of a geometric series.

In a Geometric Sequence each term is found by multiplying the previous term by a constant.

example call: geomsumList(1,2,5) #sum {1,2,4,8,16}

geomsumList(a,r,n) where

a = (the first term)

r = (the "common ratio")

n = number of terms to sum