The reason for asking this question is that the meaning of the 20 questions is abstract and the answers to the questions are not detailed. In fact, many people have asked you this question. I don't think you understand the question of the topic, so I'll read it again.

The meaning of the title is: as long as k belongs to the range of m, as long as n is greater than the range of k, no matter how much it satisfies the equation. Therefore, suppose that the set of m belongs to some real numbers, and as long as k belongs to these real numbers, these given lower bounds n are greater than these K.

Why should we take 8 as the boundary? The main purpose is to make arithmetic series, where n is 3 and 4 respectively, have the same number of arithmetic terms. Otherwise, why bother with K=3 or K=4? Exactly, when n≥8, there are the same number of terms a(n+6).

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This is my answer, everything is clear, and the problem-solving of the topic is also written in detail, which can be used for reference.