A) 18
B) 12
C) 16
D) None of the above
Correct Answer: A
Solution :
(A.M.) (H.M.) \[=ab={{(G.M)}^{2}}\] \[\Rightarrow \]\[9\ .\ 36={{(G.M)}^{2}}\]\[\Rightarrow \]\[=\frac{n(n+1)(3{{n}^{2}}+7n+2)}{12}\].
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