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Question

Which of the following cannot be the single sock?
  1. D

  2. F

  3. H

  4. E


Solution

The correct option is A

D


At least two of the pairs must be (B,D), (E,A) or (C,H). Therefore, the pairs can be

1) (B,D), (E,A), (C,H), (G,I)... F

2) (B,D), (E,A), (F,C), (G,I)... H

3) (B,D), (C,H), (F,A), (G,I)... E

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