Two radioactive substances X and Y originally have N1 and N2 nuclei respectively. Half life of X is half of the half life of Y. After three half lives of Y, number of nuclei of both are equal. The ratio \(\frac{N_1}{N_2}\) will be equal to :
1
3 ∶ 1
2
1 ∶ 3
3
8 ∶ 1
4
1 ∶ 8
5
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