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VTMO 2019 — Grade 7 — semifinal Question 10

VTMO · VTMO 2019 — Grade 7 — semifinal

Question 10

How many unordered positive-integer pairs satisfy $x + y + xy = 63$?
  1. $3$
  2. $2$
  3. $4$
  4. $6$
  5. $1$