15.6.12 Definition and properties of probability

Problem: The deck of 36 cards is divided into two parts of 18 cards. In each part there turned to be two queens. Two cards were transferred from the \( 1^{\text {st }} \) to the \( 2^{\text {nd }} \) parts. Then the young rabbit took a card from the \( 2^{\text {nd }} \) half. Find the probability that it has taken a queen.