The urn contains 12 balls: 3 yellow, 4 black, 5 red. What is the probability of pulling

The urn contains 12 balls: 3 yellow, 4 black, 5 red. What is the probability of pulling out from the urn a) black b) blue, c) not a white ball?

Let’s write the formula for finding the probability:

P (A) = m / n

Where

m is the number of favorable outcomes,

n is the total number of all possible events.

Let’s find the required probabilities:

a) P (A) = 4/12 = 1/3 – the probability of hitting the black ball.

Since there are no blue balls in the urn, the probability of getting it is zero:

b) P (A) = 0/12 = 0 – the probability of hitting the blue ball.

Since there are no white balls in the urn, and all are non-white, the probability of getting them is equal to:

c) P (A) = 12/12 = 1 – the probability of getting a non-white ball.

Answer: 1/3; 0; one.