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From module Telescoping Sums and Products
What is the value of 13⋅24⋅35…1820⋅1921⋅2022\frac{1}{3} \cdot \frac{2}{4} \cdot \frac{3}{5} \dots \frac{18}{20} \cdot \frac{19}{21} \cdot \frac{20}{22}31⋅42⋅53…2018⋅2119⋅2220?
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