Question 1061725
<pre>
25+5+1+...

{{{a[1]}}}{{{""=""}}}{{{25}}}

{{{r}}}{{{""=""}}}{{{""=""}}}{{{a[2]/a[1]}}}{{{""=""}}}{{{5/25}}}{{{""=""}}}{{{1/5}}}

{{{r}}}{{{""=""}}}{{{""=""}}}{{{a[3]/a[2]}}}{{{""=""}}}{{{1/5}}}

{{{S[infinity]}}}{{{""=""}}}{{{a[1]/(1-r)}}}

{{{S[infinity]}}}{{{""=""}}}{{{25/(1-1/5)}}}

Multiply top and bottom by 5

{{{S[infinity]}}}{{{""=""}}}{{{5*25/(5(1-1/5))}}}

{{{S[infinity]}}}{{{""=""}}}{{{125/(5-1)}}}

{{{S[infinity]}}}{{{""=""}}}{{{125/4}}}{{{""=""}}}{{{31&1/4}}}

Edwin</pre>