What's the difference between "most" and "at least" in line test logical reasoning?

In logical judgment, there are often some similar words that will affect the accuracy of understanding the topic, and finding the differences between these words and understanding them well can help us improve the accuracy of doing the topic. Today we will distinguish between "minimum" and "maximum".

"A and B have at least one", that is, the number we can choose is ≥ 1, which contains only one choice; And the possibility of choosing both, which is 2. So it is what we understand as "A or B".

"A and B have at most one", that is, the number we can choose is ≤ 1, which only contains one choice; The possibility of not choosing, that is, 0, is what we understand as "A and B cannot happen at the same time", which should be understood as "neither A nor B"

Words such as "at most" and "at least" often appear in logical judgment questions in exams, and many candidates will be very entangled in this expression and cannot accurately understand its meaning. In fact, we can find the corresponding translation method for this expression. If it is "at least one", it can be expressed in logical language "or", but if the expression is complex and difficult to translate into logical language, we don't need to rack our brains from the perspective of speech understanding. A very simple method is to express "most" and "least" with basic mathematical knowledge, and its meaning is clear at a glance.

For example, "at least two of the four people A, B, C and D attended the meeting. If this sentence is false, what conclusion can we draw? " For this expression, we can first use inequality symbols to indicate that "at least 2 people" is "≥2". This sentence is false, indicating that its contradiction is true, indicating that the people attending the meeting are "﹤2", that is, only 1 person. The following public education experts will strengthen the training of this method through a specific topic.