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If $q^{-a}  = \frac{1}{r}$ and $r^{-b}=\frac{1}{s}$ and $s^{-c} = \frac{1}{q}$ ,the value of $abc$ is______.

  1. $(rqs)^{-1}$
  2. $0$
  3. $1$
  4. $r+q+s$
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