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Two radioactive substances A and B whose half lives are 2 years and 8 years...

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Two radioactive substances A and B whose half lives are 2 years and 8 years respectively Initially 80 gm of A and 20 gm of B is taken The time after which they will have same quantity remaining is 1 6 years 1215 23 2 6 22 years 4 4 45 years

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