Two radioactive material ${X}_{1}$ and ${X}_{2}$ have decay constants $5\lambda$ and $\lambda$ respectively. If initially they have the same number of nuclei of ${X}_{1}$to that of after a time

(a)$\lambda$                                     (b)$\frac{1}{2}\lambda$

(c)$\frac{1}{4\lambda }$                                 (d)$\frac{e}{\lambda }$

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