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Two radioactive elements R and S disinte...

Two radioactive elements `R` and `S` disintegrate as `R rarr P+alpha , lambda_(R)=4.5 xx 10^(-3)` years `^(-1)` `S rarr P+beta , lambda_(s)=3 xx 10^(-3)` years `^(-1)`
Starting with number of atoms of `R` and `S` in the ratio of `2: 1`, this ratio after the lapse of three half lives of `R` will be

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