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[" Two substances "A(t_(1/2)=5min)" and "B(t_(1/2)=15" min ")" are "],[" taken in such a way that initially "[A]=4[B]." The time "],[" after which both the concentration will be equal is : "],[" (Assume that reaction is first order) "],[" (1) "5" min "],[" (2) "15" min "],[" (3) "20" min "],[" (4) concentration can never be equal "]

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