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At any instant the ratio of the amount o...

At any instant the ratio of the amount of radioactive substance is `2 : 1`. If their half lives be respectively 12 and 16 hours, then after two days, the ratio of the substances is

A

`1 : 1`

B

`2 : 1`

C

`1 : 2`

D

`1 : 4`.

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