Question

Two urns are given.The first one contains two white balls and 3 black ones and the second contains one white ball and 4 red ones. What is the probability that the ball drawn from the second urn is red?

A ball is drawn from the first urn and put into the second urn and then a ball is drawn from the second urn.

Answer 1

`66 2/3%`

Explanation:

Once you draw a ball from the first urn and put it into the second urn, the second urn will contain `6` balls, with `4` being red (the first urn does not contain any red balls). Since you have an equal probability of drawing any ball from the second urn, the probability of drawing a red ball is `4/6=2/3`, or `66 2/3%`.