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Three of the four numbers below sit right next to a perfect cube and one does not. Choose the odd one out: 26, 28, 126, 220.

Competition practiceAnalogy & Classification
  • A26
  • B28
  • C126
  • D220

Step-by-Step Solution

26 is one less than 27, 28 is one more than 27 and 126 is one more than 125, so each of those three is a single step away from a cube. The cubes on either side of 220 are 216 and 343, and 220 is four above 216, so it alone fails the rule.
Answer: D) 220

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