By rounding off, (a) $20.96$ and (b) $0.0003125$ to three significant figures, we get

21.0; 312 \times 10^{- 4}

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21.0; 3.125 \times 10^{- 4}

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21.0; 3.12 \times 10^{- 4}

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210; 3.12 \times 10^{- 4}

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Solution

The correct option is B $21.0; 3.12 \times 10^{- 4}$
By rounding off, 20.96 becomes 21.0 and 0.0003125 becomes $3.12 \times 10^{- 4}$

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