Mathematics

Problem

Which of the following arithmetic progressions is decreasing as the term number increases? a)

-8,\;-6,\;-4,\;-2,\dots

5,\;5,\;5,\;5,\dots

12,\;9,\;6,\;3,\dots

1.5,\;2.0,\;2.5,\;3.0,\dots