1. Lao Tie, there is something wrong with your question. It should be "take any number between 1 and 3" instead of "take any number between 123", which involves two probability models: classical probability model and geometric probability model (these two model concepts are explained in point 2). "Take any number between 123" is obviously a choice between 1, 2 and 3. This is the application of classical probability, so the probability greater than 2 is 1/3, and the probability greater than or equal to 2 is 2/3. But "take any number between 1 and 3", the range becomes larger, and the typical example of geometric probability can be1.11.1.8888 and so on. As for whether the result of greater than or equal to or greater than you asked is the same, in fact, this question is very simple, and you are just paranoid. Between the geometric probability 1-3, there are countless points greater than 2, 1 points equal to 2, and countless points less than 2, but they can all find one-to-one correspondence and then fall above 2, so 1 points exist relative to infinity.

2. The definitions of classical probability and geometric probability are expounded. Geometric probability has two characteristics, infinity and equal possibility (the geometric probability in the first sentence of the problem is the same as the description of the original problem), while the characteristic of classical probability is finiteness, such as choosing a number arbitrarily between 1, 2, 3 integers.

3 The answers are all here. Will you like it after reading it?