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 $[2016]$(A) $\frac{7}{4}$(B) $\frac{8}{5}$(C) $\frac{4}{3}$(D) 1
Step 1
P. be $a$ and the common difference be $d$. Then the second, fifth and ninth terms of the A.P. are $a+d$, $a+4d$ and $a+8d$ respectively. Show more…
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