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In a factory, two machines M1 and M2 manufacture 60% and 40% of the autocomponents respectively. Out of the total production, 2% of M1 and 3% of M2 are found to be defective. If a randomly drawn autocomponents from the combined lot is found defective, what is the probability that it was manufactured by M2?

- 0.35
- 0.45
- 0.5
- 0.4