Question

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

11, 22, 33,...

Answer 1

We have a₁ = 11, a₂ = 22 and a₃ = 33

a₂ – a₁ = 11

a₃ – a₂ = 11

Clearly, the difference of successive terms is same

Therefore given list of numbers form an AP.