Radioactive nuclei of P and Q disintegrates with half lives of 1 month and 2 months time t=0 number of nuclei of each P and Q is x. time at which rate of disintegration of P and Q are equal number of nuclei of R isa) x. b)1.25x. c)1.5x. d)1.75x

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Here's the solution

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a) 1.25
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