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A can do a work in 15 days and B in 20 d...

A can do a work in 15 days and B in 20 days. If they together work on it for 4 days, then the fraction of the work that is left is :

A

`frac(8)(15)`

B

`frac(7)(5)`

C

`frac(1)(4)`

D

`frac(1)(10)`

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