The Infamous Inequality

Algebra Level 2

True or False?

\quad i = 1 n a i n i = 1 n a i n \large \displaystyle \sum_{i=1}^{n} \frac{a_i}{n}\leq\prod_{i=1}^{n} \sqrt[n]{a_i}

This is an algebraic identity.

False True

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2 solutions

Hung Woei Neoh
Jul 17, 2016

i = 1 n a i n = a 1 + a 2 + a 3 + + a n n \displaystyle \sum_{i=1}^n \dfrac{a_i}{n}=\dfrac{a_1+a_2+a_3+\ldots+a_n}{n} is the arithmetic mean of a set of values

i = 1 n a i n = a 1 a 2 a 3 a n n \displaystyle \prod_{i=1}^n \sqrt[n]{a_i}=\sqrt[n]{a_1a_2a_3\ldots a_n} is the geometric mean of a set of values

By the AM-GM inequality , we know that AM \geq GM, that is

i = 1 n a i n i = 1 n a i n \displaystyle \sum_{i=1}^n \dfrac{a_i}{n} \geq \prod_{i=1}^n \sqrt[n]{a_i}

Therefore, the answer is False \boxed{\text{False}}

Bloons Qoth
Jul 15, 2016

The inequality sign is reversed.

See AM-GM inequality

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