λ and 10λ are the decay constants of two radioactive elements X and Y respectively. If decay begins wit

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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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