The result after adding $3.8 \times 10^{-6}$ with $4.2 \times 10^{-5}$ with due regard to significant figures is
  • A$4.58 \times {10^{ - 5}}$
  • B$0.458 \times {10^{ -4 }}$
  • C$4.6 \times {10^{ - 5}}$
  • D$45.8 \times {10^{ - 6}}$
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