Q1 of 89 Page 49

Which of the following form of an AP? Justify your answer.

1, 1, 2, 2, 3, 3, …

We have a1 = 1 , a2 = 1, a3 = 2 and a4 = 2


a2 - a1 = 0


a3 - a2 = 1


Clearly, the difference of successive terms is not same, therefore given list of numbers does not form an AP.


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