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  4. Three measurements are made as 18.425 cm , 7.21 cm and 5.0 cm . The sum of measurements upto correct number of significant figure is

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Q. Three measurements are made as $18.425 cm , 7.21 cm$ and $5.0 cm .$ The sum of measurements upto correct number of significant figure is

Physical World, Units and Measurements

Solution:

Sum of the measurements is correct only upto one place of decimal corresponding to the least number of decimal places. $18.425+7.21+5.0=30.635=30.6 cm$