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In the previous question , the activity of the sample after time `t` will be
A. `((mN_(A))/(M))e^(lamdat)`
B. `((mN_(A)lamda)/(M))e^(lamdat)`
C. `((mN_(A))/(Mlamda))e^(lamdat)`
D. `(m)/(lamda)(1-e^(-lamdat))`

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