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A semi-truck contains 6 electronic systems. Four of six are randomly selected simultaneously for testing and...

A semi-truck contains 6 electronic systems. Four of six are randomly selected simultaneously for testing and identified as defective or non-defective. If four of the six systems are actually defective, find the probability that : a] at least one of the two systems tested will be defective. b] that both are defective.

Math   Statistics-And-Probability   
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Given that four of six randomly selected electornic system are defective

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