Mathematics

Problem

Which of the following sequences is an arithmetic progression? a)

2,\; 5,\; 9,\; 14,\;\ldots

5,\; 8,\; 11,\; 14,\;\ldots

3,\; 6,\; 12,\; 24,\;\ldots

1,\; 4,\; 9,\; 16,\;\ldots