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The activity of the radioactive sample d...

The activity of the radioactive sample decreases form `I_0` to `I_0/3` in 9 years. After 9 years more the sample shall decrease form `(I_0)/(3)` to

A

`(I_0).6`

B

`(I_0/9)`

C

`I_0/18`

D

`I_0/27`

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