A can do a work in 12 days and B in 24 days. If they work on it together for 4 days, then what fraction of work is left?

A can do a work in 12 days and B in 24 days. If they work on it together for 4 days, then what fraction of work is left?
1). $\frac{1}{3}$
2). $\frac{1}{2}$
3). $\frac{1}{4}$
4). $\frac{1}{5}$

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