A particle moving in a straight line with uniform acceleration is observed to be a distance 𝑎 from a fixed point initially. It is at distances 𝑏, 𝑐, 𝑑 from the same point after 𝑛, 2𝑛, 3𝑛 second. The acceleration of the particle is

Question : A particle moving in a straight line with uniform acceleration is observed to be a distance 𝑎 from a fixed point initially. It is at distances 𝑏, 𝑐, 𝑑 from the same point after 𝑛, 2𝑛, 3𝑛 second. The acceleration of the particle is