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span >A and B together, B and C together and A and C together can complete a piece of work in 88 days, 66 days and 72 days respectively. Find the ratio of the efficiencies of A, B and C, respectively.

A 4:5:7

B 4:3:7

C 4:7:5

D 7:5:4

E 4:2:7

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