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CAT 2002 | Question: 96

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If $pqr=1$ then $\frac{1}{1+p+r^{-1}} + \frac{1}{1+q+r^{-1}} + \frac{1}{1+r+p^{-1}} $ is equivalent to

  1. $p+q+r$
  2. $\frac{1}{p+q+r}$
  3. $1$
  4. $p^{-1}+q^{-1}+r^{-1}$

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