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Two radioactive elements R and S disinte...

Two radioactive elements R and S disintegrate as
`RtoP+alpha,lamda_(R)=4.5xx10^(-3)"years"^(-1)`
`StoQ+betal,lamda_(S)=3xx10^(-3)"years"^(-1)`
Starting with number of atoms of R and S in the ratio of 2:1 this ratio afte4r the lapse of three half lives of R will be

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