A can do a work in 21 days and B in 42 days. If they work on - Exam Yatra

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SSC CGL Tier-2 21-February-2018 Maths
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A can do a work in 21 days and B in 42 days. If they work on it together for 7 days, then what fraction of work is left?

[SSC CGL Tier-2 21-February-2018 Maths]

A

B

C

D

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