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IMAS 2021–2022 Junior — Round 1 Question 13

IMAS · IMAS 2021–2022 Junior — Round 1

Question 13

What is the remainder when $1^2+2^2+3^2+\ldots+2020^2+2021^2$ is divided by 4?
  1. 2021
  2. 1011
  3. 1
  4. 2
  5. 3