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Two radioactive materials X(1) and X(2) ...

Two radioactive materials `X_(1)` and `X_(2)` have decay constants `10 lamda` and `lamda` respectively. If initially they have the same number of nuclei, if the ratio of the number of nuclei of `X_(1)` to that of `X_(2)` will be `1//e` after a time `n/(9lamda)`. Find the value of `n`?

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