Please submit your concern

Question:

Let S_n be sum of the first n terms of an A.P. {a_n}. If S₅ = S₉ , what is the ratio of a₃ : a₅

Explanation:

In an AP S of odd number of terms = n × (Middle term)

Given, S₅ = S₉ 

⇒ 5 × a₃ = 9 × a₉

⇒ a₃ : a₉​​​​​​​ = 9 : 5

Hence, option (a).