Hey, I am having trouble with the following proof. If Pj = ∑ Qj (limits i = j+1 to ∞), then how do you prove that : ∑ Pj (limits 0 to ∞) = ∑ j*Qj (limits j+1 to ∞) Cheers.
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If , then If you can show then you are done (since there are j terms in the sum). Otherwise I'm stumped.
Last edited by MacstersUndead; Mar 2nd 2013 at 10:39 PM.
Cheers man, managed to do it. Same logic but a different intermediary step!
I'm curious to what the different intermediary step is.
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