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A circular disc of radius R is removed f...

A circular disc of radius R is removed from a bigger circular disc of radius 2R such that the circumferences of the discs touch. The centre of mass of the new disc is at a distance aR from the centre of the bigger disc. The value of a is

A

`1/3`

B

`1/2`

C

`1/6`

D

`1/4`

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