If a1, a2, b1, b2 are the positive real numbers then \((a_1+a_2\ \dots+a_n)(\frac{1}{a_1}+\frac{1}{a_2}\dots+\frac{1}{a_n})\) is

1
≥ n3
2
> n2
3
≥ n2
4
≤ n3

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