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Half-life of a radioactive sunstance A i...

Half-life of a radioactive sunstance A is two times the half-life of another radioactive substance B Intilally the number of nuclie of A and B are `N_(A)` and `N_(B)` respectively After three half lives of A number of nuclie of bothe equal. Then the ratio `N_(A)//N_(B)` is

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The correct Answer is:
`1//8`
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