If \( 3.8 \times 10^{-6} \) is added to \( 4.2 \times 10^{-5} \), t...

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If \( 3.8 \times 10^{-6} \) is added to \( 4.2 \times 10^{-5} \), then the result in significant figures will be
(a) \( 4.58 \times 10^{-5} \)
(b) \( 4.6 \times 10^{-5} \)
(c) \( 45 \times 10^{-5} \)
(d) None of these
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