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P alone can complete a piece of work in 6 days and Q alone can complete the same piece of work in 12 days.

P alone can complete a piece of work in 6 days and Q alone can complete the same piece of work in 12 days. In how many days can P and Q together complete the same piece of work? 1. 3 days 2. 4 days 3. 6 days 4. 1 days 5. None of these

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