SEAMO 2026 Paper B — Organizer self-practice SET 4 Question 21

In mathematics, $3^1=3$, $3^2=3\times3=9$, $3^3=3\times3\times3=27$, and $3^4=3\times3\times3\times3=81$, and so on. What is the ones digit of $33^{33}$?