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The count rate from 100cm^(3) of a radio...

The count rate from `100cm^(3)` of a radioactive liquid is `c`. Some of this liquid is now discarded. The count rate of the remaining liquid is found to be `c//10` after three half-lives. The volume of the remaining liquid, in `cm^(3)`, is

A

20

B

40

C

60

D

80

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The correct Answer is:
d
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