Question

4. Which term of the AP:3, 8, 13, 18, ...,is 78?
ftarms in each of the following APs.​

Answer 1

Answer:

16th term

Explanation:

In AP, nth term = a + (n - 1)d,    symbols have usual meaning.

Here,

a = 3    , d = 8 - 3 = 5

       Let 78 be the nth term.

⇒ 3 + (n - 1)(5) = 78

⇒ (n - 1)5 = 78 - 3 = 75

⇒ n - 1 = 75/5 = 15

⇒ n = 15 + 1 = 16

 16th term is 78

Answer 2

Answer:

23

Explanation: