Two radioactive materials X1 and X2 co...

Two radioactive materials `X_1 and X_2` contain same number of nuclei. If `6lamdas^(-1) and 4lamdas^(-1)` are the decay constants of `X_1 and X_2` respectively, find the time after which ratio of number of nuclei undecayed of `X_1` to that of `X_2` will be 1/e

`1/(10lambda)`

`1/(11lambda)`

`11/(10lambda)`

`1/(9lambda)`

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