The number of days required by A, B and ...

The number of days required by A, B and C to work individually is 6, 12 and 8 respectively. They started a work doing it alternatively. If A has started then followed by B and so on, how many days are needed to complete the whole work?
In the above question if the order of working days be as B,C,A,B,C,A…(starting with B and followed by C and A respectively), then in how many days the work will he completed?

`7(3)/(4)`

`8(1)/(4)`

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