A can complete a work in 6 days while B can complete the same work in 12 days. If they work together and complete it, the portion of the work done by A is

A can complete a work in 6 days while B can complete the same work in 12 days. If they work together and complete it, the portion of the work done by A is
1). $\frac{1}{3}$
2). $\frac{2}{3}$
3). $\frac{1}{4}$
4). $\frac{1}{2}$

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