SOLUTION: What is the sum me the series? 4+6+8+10+12...+22

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Question 291995: What is the sum me the series?
4+6+8+10+12...+22
Answer by user_dude2008(1862) About Me  (Show Source):
You can put this solution on YOUR website!
4+6+8+10+12+...+22=2*2+2*3+2*4+2*5+2*6+...+2*11=2(2+3+4+5+6+...+11)=2(11(11+1)/2-1)=2(11(12)/2-1))=2(132/2-1)=2(66-1)=2(65)=130


Answer: 4+6+8+10+12+...+22=130