Question

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

–1, –1, –1, –1,...

Answer 1

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

a₂ – a₁ = 0

a₃ – a₂ = 0

a₄ – a₃ = 0

Clearly, the difference of successive terms is same,

Therefore, given list of numbers from an AP.