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An um 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

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An um 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 um and then a ball is drawn at random. What is the probability that the second ball is red? Select the correct answer from above options

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let event of drawing red ball is R let event of drawing black ball is B probability = (R,R) + (B,R) probability = 5 10 ⋅ 7 12 + 5 10 + 5 12 1 10⋅12 ⋅(35+25) 60 10⋅12 = 1 20

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