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How many significant digits are contained in the following

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1. 4.17
2. 417
3. 0.0417
4. 0.000417
5. 4.017

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When are Digits Significant?
Non-zero digits are always significant. Thus, 22 has two significant digits, and 22.3 has three significant digits.
With zeroes, the situation is more complicated:
1. Zeroes placed before other digits are not significant; 0.046 has two significant digits.
2. ...

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