Find the 20th term from the Last term of the AP: 3, 8, 13, ………�

1.	Find the 20th term from the Last term of the AP: 3, 8, 13, …………., 253.
Answer» 3, 8, 13, ………….., 253 a = 3. d = 8 – 3 = 5, a_n = 253 20^th term from the last term of the AP starting from 253 =? 253, 258, 263, ………… a₂₀ =? a = 253, d = 258 – 253 = 5, n = 20 a_n = a + (n – 1)d a₂₀= 253 + (20 – 1) 5 = 253 + 19 × 5 = 253 + 95 ∴ a₂₀ = 348 ∴ 20^th term from the last term of the AP is 348.

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

Answer»

3, 8, 13, ………….., 253

a = 3. d = 8 – 3 = 5, a_n = 253

20^th term from the last term of the AP starting from 253 =?

253, 258, 263, ………… a₂₀ =?

a = 253, d = 258 – 253 = 5, n = 20

a_n = a + (n – 1)d

a₂₀= 253 + (20 – 1) 5

= 253 + 19 × 5

= 253 + 95

∴ a₂₀ = 348

∴ 20^th term from the last term of the AP is 348.