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VTMO 2015 — Grade 9 — semifinal Question 10

VTMO · VTMO 2015 — Grade 9 — semifinal

Question 10

For integers $4 \le x \le y \le 13$, how many pairs make the mean of $4 , 4 , x , y , 13$ an integer?
  1. $7$
  2. $8$
  3. $9$
  4. $10$
  5. $11$