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None of the following pairs are reciprocals except

  • A.\( (F/A) \) and \( (P/F) \)
  • B.\( (F/P) \) and \( (A/P) \)
  • C.\( (P/A) \) and \( (A/P) \)
  • D.\( (P/A) \) and \( (A/F) \)

Answer: C

Inverting the notation gives the reciprocal, so P over A pairs with A over P and nothing else. The other three pairings do not invert into one another and their products are not unity, so neither can substitute for the other.

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