Correct Answer: Option C
Formula: If A can do a piece of work in n days, then A's 1 day's work = 1/n.
(A + B + C)'s 1 day's work = (1/24 + 1/6 + 1/12) = 7/24.
Formula: If A's 1 day's work =1/n, then A can finish the work in n days.
So, all the three together will complete the job in (24/7) Days =3(3/7) days.
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