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A source contains two phosphorus radionu...

A source contains two phosphorus radionuclides `._(15)P^(35) (T_(1//2)=14.3"days")` and `._(15)P^(33) (T_(1//2)=25.3"days")`. Initially, `10%` of the decays come form `._(15)P^(35)`. How long one must wait until `90%` do so?

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