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Evaluate the sum

 Dec 30, 2018
edited by grif389  Dec 30, 2018
 #2
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1/3, 2/9, 1/9, 4/81, 5/243, 6/729.......etc
a(n) =3^(-n) * n - closed form
∑[[3^(-n) * n], n, 1,∞] = 3/4

 Dec 30, 2018

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