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A solution contains a mixture of two iso...

A solution contains a mixture of two isotopes A (half-life=10days) and B (half-life=5days). Total activity of the mixture is `10^10` disintegration per second at time `t=0`. The activity reduces to 20% in 20 days. Find (a) the initial activities of A and B, (b) the ratio of initial number of their nuclei.

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