A, B, C alone can do a piece of work in 9, 12 and 18 days, respectively. They all started the work together, but A left after 3 days. In how many days was the remaining work completed? 

1
\(\frac{5}{2}\)
2
\(\frac{9}{5}\)
3
\(\frac{11}{4}\)
4
2

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