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How many significant figures are present...

How many significant figures are present in the following ?
i) 0.0025, ii) 208, iii) 5005, iv) 126,000 v) 500.0, vi) 2.0034

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500.0 has 4 significant figures
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VIKRAM PUBLICATION ( ANDHRA PUBLICATION)-STOICHIOMETRY -SHORT ANSWER QUESTIONS
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