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A sample of radioactive element contains...

A sample of radioactive element contains `4 xx 10^16` active nuclei. Half life of element is 10 days, then the number of decayed nuclei after 30 days is

A

`0.5 xx 10^16`

B

`1 xx 10^16`

C

`2 xx 10^16`

D

`3.5 xx 10^16`.

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