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MathNet 2026 — Part 08 Question 164

Math Olympiad Vault · MathNet 2026 — Part 08

Question 164

Let $a$, $b$, and $c$ be positive real numbers such that
$$
a b c = 1
$$
Prove that for every positive integer $n$,
$$
a + b + c \gt \frac{1}{a} + \frac{1}{b} + \frac{1}{c} .
$$