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Least count of voltmeter is the value of one division on the scale. 

The Formula is: Least count = Range/No. of divisions 

Example, if a voltmeter can measure from 0 to 40 V, and it has 100 divisions in total on the scale, then its least count is 40/100 = 0.4V
0 0 0
40/ 100 = 0.4 and 60/100 = 0.6
0 0 0
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