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A radioactive source is a mixture of two radioactive materials X and Y with mean...

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A radioactive source is a mixture of two radioactive materials X and Y with mean life time of 6 days and 9days respectively Initially 20 of radiations came from the radioactive decay of X and remaining from Y The time in past at which 80 of radiations came from the decay of X is n ln 2 days What is the value of n

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