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VTMO 2014 — Grade 8 — semifinal Question 11

VTMO · VTMO 2014 — Grade 8 — semifinal

Question 11

Which product is a perfect square, where $n ! = 1 \times 2 \times \ldots \times n$?
  1. $98 ! 99$!
  2. $98 ! 100$!
  3. $99 ! 100$!
  4. $99 ! 101$!
  5. $100 ! 101$!