Activities of three radioactive substances \( A, B \) and \( C \) a...

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Activities of three radioactive substances \( A, B \) and \( C \) are represented by the curves \( A, B \) and \( C \) in the figure. Then their halflives \( T_{1 / 2}(A): T_{1 / 2}(B) \) \( : T_{1 / 2}(C) \) are in the ratio
(a) \( 2: 1: 1 \)
(b) \( 3: 2: 1 \)
(c) \( 2: 1: 3 \)
(d) \( 4: 3: 1 \)
(JEE Main)
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