Units and Measurement

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1. 1 2019 Odisha Vernier callipers - least count #
   The main scale of a vernier calliper has n divisions/cm. n divisions of the vernier scale coincide with (n-1) divisions of main scale. The least count of the vernier calliper is,
   A $\frac{1}{(n+1)(n-1)}$ cm B $\frac{1}{n}$ cm C $\frac{1}{n^2}$ cm D $\frac{1}{n(n+1)}$ cm
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