1+2+3+```2006+2007+2008+2007+2006+```+3+2+1=?

1+2+3+```2006+2007+2008+2007+2006+```+3+2+1=?

1+2+3+```2006+2007+2008+2007+2006+```+3+2+1 =(1+2008)*2008/2+(2007+1)*2007/2 =2009*1004+2007*1004 =4032064