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VTMO 2017 — Grade 3 — final Question 1

VTMO · VTMO 2017 — Grade 3 — final

Question 1

Evaluate $10-(9+8)+(8+7)-(7+6)+(6+5)-(5+4)+(4+3)-(3+2)+(2+1)$.
  1. $1$
  2. $2$
  3. $10$
  4. $11$
  5. Another answer.