The respective number of significant figures

Question:

The respective number of significant figures for the numbers $23.023,0.0003$ and $2.1 \times 10^{-3}$ are :-

  1. $4,4,2$

  2. $5,1,2$

  3. $5,1,5$

  4. $5,5,2$


Correct Option: , 3

Solution:

$5,1,2$ resp.

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