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VTMO 2015 — Grade 8 — semifinal Question 18

VTMO · VTMO 2015 — Grade 8 — semifinal

Question 18

Find the greatest natural $k$ such that $k^{2}$ divides $10$!.
  1. $256$
  2. $360$
  3. $512$
  4. $625$
  5. $720$