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1999 AMC 8 Question 3

AMC8 · 1999 AMC 8

Question 3

Which triplet of numbers has a sum NOT equal to $1?$
  1. $(\frac12,\frac13,\frac16)$
  2. $(2,-2,1)$
  3. $(0.1,0.3,0.6)$
  4. $(1.1,-2.1,1.0)$
  5. $(-\frac32,-\frac52,5)$