Question

Find the value of S for an infinite geometric series with r=1/6 and a1=10

Answer 1

use
\[\frac{a}{1-r}\] with
\[a=10, r=\frac{1}{2}\]

Answer 2

ooops i meant \(r=\frac{1}{6}\)

Answer 3

you can almost do it in your head
one minus one sixth is five sixths and ten divided by five sixths is ten times six fifths, i.e.
\[10\times \frac{6}{5}\] then five goes in to ten twice, and two times six is twelve