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IMAS 2019–2020 Junior Division Round 2 Question 5

IMAS · IMAS 2019–2020 Junior Division Round 2

Question 5

How many ordered pairs of positive integer $(x,y)$ satisfy $x^2+5y^2=2020$?
  1. $0$
  2. $1$
  3. $2$
  4. $3$
  5. $4$