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A and B together can complete a work in ...

A and B together can complete a work in 12 days, B and C together can complete the same work in 8 days and A and C together can complete it in 16 days. In total, how many days do A, B and C together take to complete the same work? `3 5/(12)` b. `3 9/(13)` c. `7 5/(12)` d. `7 5/(13)` e. none of these

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