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HKIMO 2026 Grade 6 National Preliminary Set 02 Question 11

HKIMO · HKIMO 2026 Grade 6 National Preliminary Set 02

Question 11

Find the units digit of $A=7\times17\times27\times\cdots\times97$.
  1. 1
  2. 3
  3. 7
  4. 9