A can do work in 18 days. B can do the same work in 12 days. With the help of C, they did the work in 3 days. Then C can alone do the job in

1
\(12\frac{1}{7}\)days
2
\(8\frac{3}{7}\)days
3
\(5\frac{1}{7}\)days
4
\(1\frac{3}{7}\)days

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