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. The probability that the second ball drawn is red will be ………………….
A. \(\frac{5}{12}\)
B. \(\frac{1}{2}\)
C. \(\frac{7}{12}\)
D. \(\frac{1}{4}\)
Answer:B
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. The probability that the second ball drawn is red will be ………………….
A. \(\frac{5}{12}\) B. \(\frac{1}{2}\) C. \(\frac{7}{12}\) D. \(\frac{1}{4}\)