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Question
Choose the correct alternative:
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
Options
`5/12`
`1/2`
`7/12`
`1/4`
Solution
`1/2`
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