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In a vernier callipers, one main scale d...

In a vernier callipers, one main scale division is x cm and n divisions of the vernier scale coincide with (n-1) divisions of the main scale. The least count (in cm) of the callipers is :-

A

`(p)/(q)(p-1)`

B

`(p)/(q)`

C

`(q-1)/(pq)`

D

`(1)/(pq)`

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The correct Answer is:
D
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