A can do a work in 36 days and B in 12 days. If they work on it together, then in how many days will they be able to do the work?

A can do a work in 36 days and B in 12 days. If they work on it together, then in how many days will they be able to do the work?
1). 8
2). 6
3). 10
4). 9

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