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HKIMO 2026 Grade 5 National Preliminary Set 03 Question 10

HKIMO · HKIMO 2026 Grade 5 National Preliminary Set 03

Question 10

Find $\frac1{1\times2}+\frac1{2\times3}+\cdots+\frac1{48\times49}+\frac1{49\times50}$.
  1. $\frac{49}{100}$
  2. $\frac1{50}$
  3. $\frac{49}{50}$
  4. $\frac12$