A) 1
B) 6
C) 9
D) None
Correct Answer: C
Solution :
[c] \[AM\ge HM\] \[\Rightarrow \,\frac{a+b+c}{3}\ge \frac{3}{\frac{1}{a}+\frac{1}{b}+\frac{1}{c}}\] \[\Rightarrow \,(a+b+c)\left( \frac{1}{a}+\frac{1}{b}+\frac{1}{c} \right)\ge 9\]You need to login to perform this action.
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