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Two radioactive substances A and B have ...

Two radioactive substances `A` and `B` have half lives of `T` and `2T` respectively. Samples of `a` and `b` contain equal number of nuclei initially. After a time `4T`, the ratio of the number of undecayed nuclei of `A` to the number if undecayed nuclei of `A` to the number of undeacyed nuclei of `B` is

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