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HKIMO 2026 Grade 7 National Preliminary Set 01 Question 10

HKIMO · HKIMO 2026 Grade 7 National Preliminary Set 01

Question 10

Find $1\times2+2\times3+3\times4+\cdots+25\times26$.
  1. 5850
  2. 5580
  3. 8550
  4. 8505