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nuclei A decays to B and then to C(stable)

A and B have the same decay constant, n

Initially the amount of A is N(0)>0 while B and C are zero

then the amount of A at any time is :

N(t)=N(0)exp(-nt)

can somebody derive the equation for the amount of sample B and C as a function of time ?

thanks

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# Radioactive decay problem

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