An urn contains 5 red and 5 black balls. A balls 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 . Then probability that the second ball drawn is red will be .......
A
`5/12`
B
`1/2`
C
`7/12`
D
`1/4`
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