a box contains ten `pairs of shoes if four shoes are retired there are numeration (1 I) (2 I) (10 I)
X is the set formed by 20 numbers Find the triplet Calculate probability P(Ai)
To calculate the probability P(Ai) of a particular event Ai occurring, we need to know two things: the total number of possible outcomes and the number of favorable outcomes.
In this case, X is a set of 20 numbers. However, it is not clear what the elements of the set are or how they are related to the information about the box of shoes. Please provide more details or clarify the question so that we can determine the total number of possible outcomes and the number of favorable outcomes for the event Ai.