Question

III. Answer the following questions: - 17.Find the 20th term of an AP 10, 13,16........​

Answer 1

a₂₀ = 67

Explanation:

the nth term of an arithmetic sequence is

`a_(n)` = a₁ + (n - 1)d

a₁ is the first term , d the common difference , n the term number

here a₁ = 10 , d = a₂ - a₁ = 13 - 10 = 3 , and n = 20 , so

a₂₀ = 10 + (19 × 3) = 10 + 57 = 67