Question

连续奇数列用n表示规律1 3 5 7 9 11..这样的连续奇数列,怎么用字母n表示其规律

Answer 1

1 = 1 = 1 + 1 - 1

3 = 2 + 1 = 2 + 2 - 1

5 = 3 + 2 = 3 + 3 - 1

7 = 4 + 3 = 4 + 4 - 1

9 = 5 + 4 = 5 + 5 - 1

由上可知

第n个数字 = n + n -1 = 2n -1