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Two resistors are connected $(a)$ in series $(b)$ in parallel. The equivalent resistance in the two cases are $9$ $ohm$ and $2$ $ohm$ respectively. Then the resistances of the component resistors are
  • A$2$ $ohm$ and $7$ $ohm$
  • B$3$ $ohm$ and $6$ $ohm$
  • C$3$ $ohm$ and $9$ $ohm$
  • D$5$ $ohm$ and $4$ $ohm$
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