1.639 x 10\(^2\)
1.639 x 10\(^1\)
1.639 x 10\(^{-1}\)
1.639 x 10\(^{-2}\)
Correct answer is C
\(\frac{0.42 \div 2.5}{0.5 \times 2.05} = \frac{0.168}{1.025}\)
= 1.639 x 10\(^{-1}\)
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