For an A.P. t3 = 8 and t4 = 12, find the common difference d.

For an A.P.  t₃ = 8 and t₄ = 12, find the common difference d.

Ans.

t3 = 8    and t4 = 12   [Given]

d = tn  - tn – 1

∴ d = t4 – t3  = 12 – 8 = 4

∴ The common difference is 4.