A, B and C can complete a piece of work in 12, 24 and 36 days respectively. In how many days will they together complete the same work ?

A, B and C can complete a piece of work in 12, 24 and 36 days respectively. In how many days will they together complete the same work ?
1). $5\frac{6}{11}$ days
2). 4 days
3). $6\frac{6}{11}$ days
4). 6 days

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