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Question

Two radioactive elements R and S disintegrates as
RP+α;λR=4.5×103years1SP+β;λS=3×103years1
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 :

A
3 : 2
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B
1 : 3
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C
1 : 1
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D
2 : 1
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