1.

A and B are two students. Their chances of solving a problem correctly are (1)/(3) and (1)/(4),respectively. If the probability of their making a common error is (1)/(20)and they obtain the same answer, then the probability of their answer to be correct is ..........

Answer»

`(1)/(12)`
`(1)/(40)`
`(13)/(120)`
`(10)/(13)`

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