Phương pháp tìm số hạng tổng quát của một dãy số

Abstract

In some sequence problems, students usually encounter sequences , showed by a mathematical formula, requiring them to find the first term, the second term, and so on in a sequence. This type of problems is not hard for students. However, it becomes harder when some terms of the sequence are firstly provided and students are required to find out the sequence’s n^th term. In this paper, we not only introduce a method to find the sequence’s n^th term by common difference, but also apply it to calculate the sum of a sequence.