Find the 20 th term from the end of the AP : 3, 8, 13, …., 253.

Question

Philoid · Accepted Answer

Given:

First term (a) = 3

Common difference (d) = n₂ – n₁ = 8-3 = 5

a_n = a + (n-1)d

a₂₀ = a + (20-1)d

= 3 +19×5

= 98

Find the 20thterm from the end of the AP : 3, 8, 13, …., 253.