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MathNet 2021 — Part 07 Question 1

Math Olympiad Vault · MathNet 2021 — Part 07

Question 1

What is the sum of the digits of $20^{21}+(10^{2021}+21)^2$?
  1. 21
  2. 30
  3. 37
  4. 42
  5. A number greater than 100.