A chain is lying on a rough table with a...

A chain is lying on a rough table with a fraction 1/n of its length hanging down from the edge of the table. if it is just on the point of sliding down from the table, then the coefficient of friction between the table and the chain is -

`(1)/(3)`

`(2)/(3)`

`(1)/(4)`

`(1)/(5)`

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