A chain is held on a frictionless table ...

A chain is held on a frictionless table with `1//n` th of its length hanging over the edge. If the chain has a length L and a mass M, how much work is required to pull the hanging part back on the table?

`(MgL)/(2n^(2))`

`(MgL)/(n^(2))`

`(MgL)/(4n^(3))`

`(MgL)/(3n^(-1))`

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