Half-life of a radioactive substance A a...

Half-life of a radioactive substance` A` and `B` are, respectively, `20 min` and `40min`. Initially, the samples of `A` and `B` have equal number of nuclei. After `80 min`, the ratio of the ramaining number of `A` and `B` nuclei is

`1 : 16`

`4 : 1`

`1 : 4`

`1 : 1`

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