Two resistors of resistances $R_1 = (300 \pm 3) \,\Omega $ and $R_2 = (500 \pm 4)$ are connected in series. The equivalent resistance of the series combination is
  • A$(800 \pm 1) \,\Omega $
  • B$(800 \pm 7) \,\Omega $
  • C$(200 \pm 7) \,\Omega $
  • D$(200 \pm 1) \,\Omega $
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