in a certain factory, machines I, II, and III are all producing springs of the same length. Machines I, II, and III produce 1%, 4% and 2% defective springs, respectively. Of the total production of springs in the factory, Machine I produces 30%, Machine II produces 25% and Machine III produces 45%. If one spring is selected at random from the total springs produced in a given day, determine the probability that it is defective.

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