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In a certain code, PAPER is written as REPAP. What is the rule?

Correct answer: B. the word is written in reverse order

  • A. each letter is shifted forward
  • B. the word is written in reverse order
  • C. vowels are replaced by consonants
  • D. alternate letters are swapped

Explanation

Reading PAPER backwards gives REPAP exactly, with no letter changed. Reversal codes are recognised by the fact that the same set of letters appears in the output. Comparing the letter sets of input and output is the first check worth making.

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Coding and decoding questions replace letters, numbers, words or symbols with another pattern and ask you to identify the rule or decode a new item. Methods include alphabet positions, shifts, reversals, substitution, rearrangement, numerical values and separate rules for different parts of a code.

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