From an urn containing 4 white balls, 3 black and 7 red balls, 1 ball is taken at random.

From an urn containing 4 white balls, 3 black and 7 red balls, 1 ball is taken at random. What is the likelihood that it will be white or black?

A – the pulled out ball turns out to be white or black.

The probability of event A is the ratio of the sum of the number of white and black balls to the total number of balls in the urn.

Find the number of white and black balls:

4 + 3 = 7.

Find the total number of balls:

4 + 3 + 7 = 14.

P (A) = 7/14 = 0.5.

Let’s express the probability as a percentage:

0.5 * 100% = 50%.

Answer: The probability that the ball will turn out to be white or black is 0.5 (50%).