deletions | additions       diff --git a/Version3.tex b/Version3.tex  index 9b019c2..452ac3a 100644  --- a/Version3.tex  +++ b/Version3.tex 
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) +  \frac{d}{2}(1-2n)(n^2-n)  )  \intertext{After $$   After  some simplification, we are left with:} with:  $$ \sum_{i=0}^{n-1} f_2(n,i) = \frac{d}{6}n^3 + (\frac{c+d}{2})n^2 (\frac{c+d}{2})n