If a Smartphone is Defective, Which Factory Made It?
Problem 738
A certain model of smartphone is manufactured by three factories A, B, and C. Factories A, B, and C produce $60\%$, $25\%$, and $15\%$ of the smartphones, respectively. Suppose that their defective rates are $5\%$, $2\%$, and $7\%$, respectively.
If a smartphone of this model is found out to be detective, what is the probability that this smartphone was manufactured in factory C?
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