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In a radioactive decay sequence A (lamb...

In a radioactive decay sequence `A (lambda_(1))/(longrightarrow)` `B` `(lambda_(2))/(longrightarrow)`C` `(lambda_(3))/`(longrightarrow)` D` What is the ratio of numbers of atoms of A to the number of atoms of B after long time interval starting with pure A .The mean lives of A and B are 20 hours and "30" minutes respectively

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