Question

an urn I contain 3 white and 4 red balls and an urn II contain 5 white and 6 red balls. one ball is drawn at random from one of urn and is found to b white, find the probability that it was drawn from urn I.​

Answer 1

Answer:

Since there is replacement after every ball is drawn, there are always 3 white balls and 6 red balls in the urn. The probability of drawing a white ball from the urn is, therefore, 39 since there are 3 white balls. The probability of drawing a red ball from the urn is, therefore, 69 since there are 6 red balls.