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How many significant figures are present...

How many significant figures are present: (1) 0.0025
(2) 208
(3) 5005
(4) 126,000
(5) 500.0
(6) 2.034

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(1) 2
(2) 3
(3) 4
(4) 6
(5) 4
(6) 4
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