Ratio of activities of two elements from their half-lives and numbers of atoms

1. A.
   $\frac{N_1 T_1}{N_2 T_2}$
2. B.
   $\frac{N_2 T_2}{N_1 T_1}$
3. C.
   $\frac{N_1 T_2}{N_2 T_1}$
4. D.
   $\frac{N_1 T_2}{N_1 T_2}$

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1. A.
   $\dfrac{N_1T_1}{N_2T_2}$
2. B.
   $\dfrac{N_1T_2}{N_2T_1}$
3. C.
   $\dfrac{N_1T_2}{T_1T_2}$
4. D.
   $\dfrac{T_1T_2}{N_1N_2}$

Tap an option to check your answer.