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HKIMO 2026 Grade 6 National Preliminary Set 02 Question 8

HKIMO · HKIMO 2026 Grade 6 National Preliminary Set 02

Question 8

Find $1\times2+2\times3+3\times4+4\times5+\cdots+10\times11$.
  1. 270
  2. 440
  3. 460
  4. 670