Which of the following form of an AP? Justify your answer.
0, 2, 0, 2, …
We have a1 = 0, a2 = 2, a3 = 0 and a4 = 2
a2 - a1 = 2
a3 - a2 = - 2
a4 - a3 = 2
Clearly, the difference of successive terms is not same, therefore given list of numbers does not form an AP.