In how many days can a work be completed by A and B together?

1.	In how many days can a work be completed by A and B together?
A.	Any two of the three
B.	II and either I or II
C.	I and II only
D.	II and III only
E.	None of these
Answer» B. II and either I or II

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In how many days can a work be completed by A and B together?

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