A can complete a work in ‘m’ days and B can complete it in ‘n’ days. How many days will it take to complete the work if both A and B work together ?
[A] (m+n)\ days
[B] \left ( \frac{1}{m}\times \frac{1}{n} \right )\ days
[C] \left ( \frac{m+n}{mn} \right )\ days
[D] \left ( \frac{mn}{m+n} \right )\ days

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