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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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(i) 2, (ii) 3, (iii) 4, (iv) 3, (v) 4, (vi) 5
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