There are 2 white , 4 black balls in urn...

There are 2 white , 4 black balls in urn A, In urn B, there are 5 white and 7 black balls. If one ball is randomly replaced from A and B , and a ball is drawn from B then the probability for the ball to be white one is

`17/40`

`14/40`

`19/45`

`16/39`

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