A student measures certain lengths using a meter scale having least count equal to 1mm. Which one of the following measurements is more precise?

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Q: (NDA-II/2019)
A student measures certain lengths using a meter scale having least count equal to 1mm.
Which one of the following measurements is more precise?
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question_subject: 

Science

question_exam: 

NDA-II

stats: 

0,8,21,11,5,8,5

keywords: 

{'meter scale': [0, 0, 0, 1], 'measurements': [0, 0, 0, 2], 'certain lengths': [0, 0, 0, 1], 'cm': [2, 0, 7, 20], 'mm': [0, 0, 0, 1]}