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Least count of any instrument is the minimum quantity you can measure with it.
For example, with the commom ruler(scale) you get in market, you can measure a minimum length of 1 mm. So its least count is 1 mm. There are good conceptual questions on least count in NCERT books of Class 11 (they had in 2004, I dont know if the new editions also have it)
Apart from that, least count is a vey easy topic. Even if you just practice the questions which appeared in last 10 yrs JEE exam, that is more than enough.
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