TÌM 1 1 1 1      L LIM ...      1 1 2 1 2 3 1 2 3 ......

Câu 43: Tìm 1 1 1 1

      

L lim ...

      

1 1 2 1 2 3 1 2 3 ... n

 

A. L  1, 5 . B. L  2 . C. L  3 . D. L  4 .