Question

✔✔1.Find the 20th term from the last term of the AP :3, 8, 13,....253✔✔

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Answer 1

hey here is your answer :-



l - ( n - 1) d


put the values


= 253 - (20 - 1)5


= 253 - 19*5


= 253 - 95


= 158

Answer 2

Answer:

158

Step-by-step explanation:

Given A.P is 3,8,13,.... 253.

Here,

⇒ First term a = 3.

⇒ Common difference, d = 5.

In the question it was asked to find from the last term.

Therefore, this AP can be Written in reverse order as 253, 248, 243... 8,3.

For this A.P:

⇒ First term, a = 253.

⇒ Common difference, d = -5.

⇒ n = 20{20th term}

Now,

∴ We know that nth term of an AP an = a + (n - 1) * d

a ₂₀ = 253 + (20 - 1) * (-5)

      = 253 - 100 + 5

      = 158.

∴ 20th term of the AP = 158.

Hope it helps!