(1/3+1/6+1/12+1/24+1/48+1/96+1/192+1/384)*128

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(1/3+1/6+1/12+1/24+1/48+1/96+1/192+1/384)*128
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(1/3+1/6+1/12+1/24+1/48+1/96+1/192+1/384)*128
(1/3+1/6+1/12+1/24+1/48+1/96+1/192+1/384)*128

(1/3+1/6+1/12+1/24+1/48+1/96+1/192+1/384)*128
=1/3*128*(1+1/2+1/4+.+1/128)
=1/3*128*(2-1/128)
=85

(1/3+1/6+1/12+1/24+1/48+1/96+1/192+1/384)*128
=(1/3+1/6+1/12+1/24+1/48+1/96+1/192+(1/384+1/384)-1/384)*128
=(1/3+1/6+1/12+1/24+1/48+1/96+(1/192+1/192)-1/384)*128
=(1/3+1/3-1/384)*128
=128×2/3-128/384
=256/3-1/3
=255/3
=85