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Half-lives of two radioactive elements A...

Half-lives of two radioactive elements A and B are 20 minutes and 40 minutes respectively. Initially, the samples have equal number of nuclei. After 80 minutes, the ratio of decayed numbers of A and B nuclei will be

A

`1:16`

B

`4:1`

C

`1:4`

D

`5:4`

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The correct Answer is:
D
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