1.

There are two bags one of whichcontains 3 black and 4 white balls, while the other contains 4 black and 3 white balls. A die is cast. If the face 1 or 3 turns up, a ball is taken from the first bag, and if any other face turns up, a ball is chosen from the second bag. The probability of choosing a black ball is

Answer»

`11//21`
`10//21`
`9//21`
`8//21`

ANSWER :A


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