Posted by Anonymous on Thursday, March 1, 2012 at 11:18pm.
21terms/3terms=7groups of 3terms
237(last group)-129 (middle group)=36
237(group7)-36=201(group6)
group6-36
group5-36
129(group4)-36=95(group3)
group3-36
group2-36
add up all group terms(237+201+165...)
Hope thats what your looking for if not sorry, but that should be right
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