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How many significant figures are present...

How many significant figures are present in the following?
a. 0.0025
b. 208
c. 5005
d. 126000
e. 500.0
f. 2.0034

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(i) 2, (ii) 3, (iii) 5005 , (iv) 3, (v) 4, (vi) 5
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