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require 'win32ole' 

excel = WIN32OLE.new("excel.application") 
excel.Workbooks.Add 


excel.Range("a1").Value = 10 
excel.Range("a2").Value = 20 
excel.Range("a3").Value = "=a1+a2" 
excel.Range("a1:a3").each do |cell| 
    p cell.Value 
end