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A and B are two students. Their chances ...

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 ..........

A

`(1)/(12)`

B

`(1)/(40)`

C

`(13)/(120)`

D

`(10)/(13)`

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The correct Answer is:
D
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