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12+34×2+56×4×2+78×6×4×2+⋯= ?\frac 1{2}+\frac 3{4\times2}+\frac 5{6\times4\times2}+\frac 7{8\times6\times4\times2}+\cdots=\, ?21+4×23+6×4×25+8×6×4×27+⋯=?
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