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HKIMO 2026 Grade 8 National Preliminary Set 03 Question 12

HKIMO · HKIMO 2026 Grade 8 National Preliminary Set 03

Question 12

Find the units digit of $9\times19\times29\times\cdots\times99\times109$.
  1. 9
  2. 7
  3. 3
  4. 1