Q1 of 89 Page 49

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

Clearly, the difference of successive terms is same, therefore given list of numbers from an AP.

2, 2², 2³, 2⁴

Justify whether it is true to say that forms an AP as a₂ - a₁ = a₃ - a₂

For the AP - 3, - 7, - 11, … can we find directly a₃₀ - a₂₀ without actually finding a₃₀ and a₂₀ reason for your answer.