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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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a. 2, b. 3, c. 4, d. 3, e. 4, f. 5
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