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1 × 2 / 1 + 2 × 3 / 1 + 3 × 4 / 1 + 4 × 5 / 1 +. + 99 × 100 / 1 =1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+…… +1/99-1/100 =1-1/100 =99/100 =0.99
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