Question: A certain computer system breaks down in 2 main ways: faults on the network and power supply faults Of the last 50 breakdowns 42 involved

A certain computer system breaks down in2 main ways: faults on the network and power supply faults Of the last 50 breakdowns 42 involved network faults and 20 power failures In 13 cases both the power supply and the network were faulty How many breakdowns were attributable to other kinds of failure

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