The Student Room Group

Infinite series

Can someone explain in simple terms how the sum of the infinite series 1+2+3+4...etc equals -1/12?

This is why I became a plumber and not a mathematician!
http://www.youtube.com/watch?v=w-I6XTVZXww

This video is really good at explaining it - though I really don't like the fact it is based upon an average...

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