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IKMC 2006 - Grades 5-6 - Self-study Question 19

IKMC · IKMC 2006 - Grades 5-6 - Self-study

Question 19

In which triple is the central number exactly halfway between the other two?
  1. $\frac12,\frac13,\frac14$
  2. 12, 21, 32
  3. 3, 7, 13
  4. $\frac13,\frac12,\frac23$