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HKIMO 2026 Grade 4 National Preliminary Set 05 Question 12

HKIMO · HKIMO 2026 Grade 4 National Preliminary Set 05

Question 12

Find the last digit of $5\times15\times25\times\cdots\times2005\times2015$.
  1. 5
  2. 9
  3. 7
  4. 0