Algebra
# Power Mean Inequalities

Given positive \( a_1, a_2, \ldots, a_j, \) let \( f \) be defined as

\[ f(n) = \left(\frac{a_1^n + a_2^n + \cdots + a_j^n}{j}\right)^{1/n}. \]

For \( m > n \), which of the following is necessarily true?

What is the smallest \( n \) for which

\[ \left(a^3 + b^3\right)^2 \leq n (a^6 + b^6) \]

holds for all positive \( a \) and \( b \)?

What is the largest \( n \) for which

\[ (x + y) (y + z) (x + y + z) \geq \frac{n x^2 y^3 z^2}{(x + y)(y + z)(xy + xz + yz)} \]

holds for all positive \( x, y, z \)?

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