Two radioactive materials X1 and X2 have...

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, then the ratio of the number of nuclei of `X_1` to that of `X_2` will be `1//e` after a time.

`1//(10lambda)`

`1//(11lambda)`

`11//(10lambda)`

`1//(9lambda)`

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