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Four - the last zero is not significant.

* * * * *

Unfortunately, that is not true. Integers ending in 0 are ambiguous cases.

It is not possile to tell whether the number is accurate to the nearest integer (5 sig digs) or rounded to the nearest 10 (4 sig digs).

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11y ago
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13y ago

Five

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Q: How many significant digits does 20401 have?
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