A alone can complete a piece of work in 6 days and B alone can complete it in 12 days. In how many days can A and B together complete the same piece of work ?

 A alone can complete a piece of work in 6 days and B alone can complete it in 12 days. In how many days can A and B together complete the same piece of work ?

A). 1 day

B). 2 days

C). 3 days

D). 4 days

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