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Smita can finish a work in12 days and Sa...

Smita can finish a work in12 days and Sam can finish the same work in 9 days. After working together for 4 days, they both leave the job. What is the fraction of unfinished work?
(A) `frac(1)(2)`
(B)`fac(7)(9)`
(C) `frac(2)(9)`
(D) frac(1)(4)`

A

A

B

D

C

C

D

B

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