Question

In the first of an A.P is 17 and common difference in 3 then the 21st term will be ______?
a) 43
b) 40
c) -43
d) -40 ​

Answer 1

Answer:

77

Step-by-step explanation:

GIVEN

First term (a) = 17

Common difference (d) = 3

nth term (Tₙ) = a + (n-1)d

THEN,

21st term (T₂₁) = 17 + (21 - 1)3

⇒ T₂₁ = 17 + (20)3

⇒ T₂₁ = 17 + 60

⇒ T₂₁ = 77