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IMAS 2013 — Upper Primary Grades 5–6 — Round 2 Question 5

IMAS · IMAS 2013 — Upper Primary Grades 5–6 — Round 2

Question 5

What is the sum of the digits of the number whose square is equal to $15984\times48951$ ?
  1. 18
  2. 21
  3. 24
  4. 27
  5. 36