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1/10+1/40+1/88+`````+1/460

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1/10+1/40+1/88+`````+1/460
1/10+1/40+1/88+`````+1/460
=1/3*(1/2-1/5+1/5-1/8+1/8-1/11+……+1/20-1/23)
=1/3*(1/2-1/23)
=1/3*21/46
=7/46