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HKIMO 2026 Grade 3 National Preliminary Set 04 Question 11

HKIMO · HKIMO 2026 Grade 3 National Preliminary Set 04

Question 11

Define $a\Delta b=(a-b)\times(a+b)-5$. Find $5\Delta3$.
  1. 15
  2. 11
  3. 8
  4. 2