Q 1212545439.     `λ` and `10λ` are the decay constants of two radioactive elements `X` and `Y` respectively. If decay begins with the same number of atoms of them, the ratio of atoms of `X` to those of `Y` after time `1/(9λ)` will be

A

`e`

B

`e^(-2)`

C

`e^(-1)`

D

`e^(2)`

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