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AIMO 2021 Primary 6 — Preliminary (Open Trial 1) Question 13

AIMO · AIMO 2021 Primary 6 — Preliminary (Open Trial 1)

Question 13

Find the unit digit of $19^{19}+97^{97}+2020^{2020}$.
  1. 6
  2. 7
  3. 8
  4. 9