List of top Physics Questions on Radioactive Decay asked in Joint Entrance Exam

A radioactive nucleus $n_2$ has 3 times the decay constant as compared to the decay constant of another radioactive nucleus $n_1$ . If the initial number of both nuclei are the same, what is the ratio of the number of nuclei of $n_2$ to the number of nuclei of $n_1$ , after one half-life of $n_1$ ?