From the urn, which contains 4 white and 8 black balls, take out one ball at random.

From the urn, which contains 4 white and 8 black balls, take out one ball at random. Then the probability that this ball will be white is equal to …

1. First, let’s calculate how many balls are in the urn if, according to the condition of the problem, there are 4 white balls and 8 black balls in it. To do this, let’s perform addition.

4 + 8 = 12 balls.

2. Since there are 4 white balls in the urn, therefore there can be only 4 favorable outcomes.

3. Now let’s calculate what is the probability that the ball taken at random from the urn turns out to be white.

p = 4/12 = 0.33.

Answer: The probability that the ball taken at random from the urn turns out to be white is p = 0.33.