Mathematics, 03.09.2021 14:00 coxb234

1,1,3,1/3,9,1/9 prove sum of 2n temrs is 1/2(2+3^n-3^1-n)

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1,1,3,1/3,9,1/9 prove sum of 2n temrs is 1/2(2+3^n-3^1-n)...