My First International Competition!
Algebra
Level
3
Given a function \(f:\mathbb N \to \mathbb N\) which is strictly increasing and satisfies \(f\big(f(x)\big) = 3x\) for all \(x\), find \(f(16)\).
\[\] Notation: \(\mathbb N \) denotes the set of positive integers.
by
Manuel Kahayon