Question

If a₁,a₂,a₃ , ... upto a₂₁ are in A.P. with common difference d , then a₁,a₅,a₉,a₁₃ are ?

(a) must be in A.P. with common difference 16 d

(b) must be in A.P. with common difference 4 d

(c) must be in A.P. with common difference d

(d) May not be in A.P

PLEASE TELL ME THE CORRECT ANSWER.....​

Answer 1

Answer:

option c ..... this is crct pls mark as brain list