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Which group contains ONLY letters that look unchanged BOTH in an upright mirror and in water?

Competition practiceMirror & Water Images
  • AA, H, O, X
  • BB, H, I, O
  • CD, I, O, X
  • DH, I, O, X

Step-by-Step Solution

Unchanged in an upright mirror needs a vertical line of symmetry; unchanged in water needs a horizontal one. H, I, O and X have both. A has only a vertical line (it fails in water); B and D have only a horizontal line (they fail in the mirror).
Answer: D) H, I, O, X

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