1.

An urn contains 5 red and 5 black balls. A ball is drawn at random, its colour is noted and is returned to the urn. Moreover, 2 additional balls of the colour drawn are put in the urn and then a ball is drawn at random. The probability that the second ball drawn is red will be:

Answer»

`(5)/(12)`
`(1)/(2)`
`(7)/(12)`
`(1)/(4)`

ANSWER :B


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