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Activities of three radioactive substanc...

Activities of three radioactive substances A, B and C are represented by the curves A, B and C, in the figure. Then their half- lives `T_(1/2)(A): T_(1/2) (B): T_(1/2)(C )` are in the ratio :

A

`2 : 1 : 1`

B

`3 : 2 : 1`

C

`2 : 1 : 3`

D

`4 : 3 : 1`

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