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SEAMO 2021 — Paper E — Grade 9–10 Question 12

SEAMO · SEAMO 2021 — Paper E — Grade 9–10

Question 12

Find the minimum of $\sum_{k=1}^{20}|n-k|$ over positive integers $n$.
  1. $50$
  2. $100$
  3. $120$
  4. $150$
  5. None of the above