yogi_Sum Every Nth Cell In A Column Starting With Specified Row Number

                                          Google Spreadsheet   Post  #1362
Yogi Anand, D.Eng, P.E.      ANAND Enterprises LLC -- Rochester Hills MI     www.energyefficientbuild.com.   Sep 08, 2013
user suryakoduri (http://productforums.google.com/forum/#!category-topic/docs/spreadsheets/TunQ6imohcU)
Sum every 10th cell in a column
simplify =sum(K2,K12,K22,K32,K42,K52,K62)
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