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Question: andnbspandnbspheloandnbsp i get stuck in question 418andnbspi dont understand what...

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Helo  i get stuck in question 4.18 

i dont understand what (2) this graph is drawing about,how does this related to the equation with double summation

in (1)(the black circle i draw)how does the author comes into conclusion such that r=1 to n --> r=1 to infinity

 

thank you

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