A and B can complete a job in days. A and C can do it in days, while B and C can do it in days. The time required for A, B, and C to complete the job if they work together is ....
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A and B can complete a job in days. A and C can do it in days, while B and C can do it in days. The time required for A, B, and C to complete the job if they work together is ....