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HKIMO 2026 THPT (Grades 10–12 shared) National Preliminary Set 01 Question 21

HKIMO · HKIMO 2026 THPT (Grades 10–12 shared) National Preliminary Set 01

Question 21

A box contains 5 red balls and 5 blue balls. Jack draws 3 balls simultaneously. Find the probability that all three are red.
  1. $\frac1{12}$
  2. $\frac1{10}$
  3. $\frac18$
  4. $\frac12$