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Solve the equation

Question:

If the $2^{\text {nd }}, 5^{\text {th }}$ and $9^{\text {th }}$ terms of a non-constant A.P. are in G.P., then the common ratio of this G.P.is

1. $\frac{7}{4}$

2. $\frac{8}{5}$

3. $\frac{4}{3}$

4. 1

Correct Option:

Solution: