A radioactive sample is a mixture of two radioactive species – one having population `N_(1)`has a mean life of `T_(1)` and the other one having population `N_(2)` has nuclei having mean life of `t_(2)`. Find the effective mean life of the nuclei in the mixture.

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Correct Answer - `(N_(1)t_(1)+N_(2)t_(2))/(N_(1)+N_(2))`

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