Question

В урне лежат 12 шариков: 5 красного цвета, 4 синего и 3 белого. Вынимают наугад по одному шарику. Найти вероятность того, что третий по счету вынутый шарик окажется белого цвета.

Answer 1

Problem Analysis

We are given an urn containing 12 balls: 5 red, 4 blue, and 3 white. We need to find the probability that the third ball drawn from the urn is white.

Solution

To find the probability, we need to determine the total number of possible outcomes and the number of favorable outcomes.

The total number of possible outcomes is the total number of balls in the urn, which is 12.

The number of favorable outcomes is the number of white balls in the urn, which is 3.

Therefore, the probability of drawing a white ball on the third draw is given by:

Probability = Number of favorable outcomes / Total number of possible outcomes

Probability = 3 / 12

Simplifying the fraction, we get:

Probability = 1 / 4

So, the probability that the third ball drawn from the urn is white is 1/4.

Answer

The probability that the third ball drawn from the urn is white is 1/4.