1.

There are two boxes. One box contains 3white balls and 2 black balls. The other boxcontains 7 yellow balls and 3 black balls. If abox is selected at random and from it, a ball isdrawn, the probability that the ball is black is

Answer»

`(7)/(20)`
`(1)/(5)`
`(3)/(20)`
`(1)/(3)`

Answer :A


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