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VTMO 2015 — Grade 9 — semifinal Question 15

VTMO · VTMO 2015 — Grade 9 — semifinal

Question 15

Choose three distinct lengths from $1 , 2 , \ldots , 10$ to form a triangle. How many choices?
  1. $45$
  2. $46$
  3. $49$
  4. $50$
  5. $55$