Ratio of the numbers of nuclei of two substances with different half-lives after a time

1. A.
   $\frac{8}{1}$
2. B.
   $\frac{1}{8}$
3. C.
   $\frac{3}{1}$
4. D.
   $\frac{1}{3}$

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1. A.
   $3.38 \times 10^{24}$
2. B.
   $1.69 \times 10^{24}$
3. C.
   $6.76 \times 10^{24}$
4. D.
   $6.76 \times 10^{23}$

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1. A.
   $1/4$
2. B.
   $1/8$
3. C.
   4
4. D.
   8

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