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M can complete (3)/(4) part of a work in...

M can complete `(3)/(4)` part of a work in 12 days and N can complete `(2)/(7)` part of the same work in 8 days. In how many days will both complete `(11)/(14)` part of the total work?

A

8

B

9

C

7

D

6

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