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

`13/40`

D

`10/13`

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