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    myra1078's Avatar
    myra1078 Posts: 2, Reputation: 1
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    #1

    Jun 30, 2010, 07:58 AM
    probability if both are defective in each case, 120 auto ignition circuits, 18 defect
    Of 120 auto ignition circuits, there are 18 defects. If 2 circuits are randomly selected, find the probability that they are both defective in each case
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Jun 30, 2010, 08:45 AM
    We choose the two defects from the 18 defects. We choose 0 good ones from the 102 good ones. Overall, we choose two from the 120.




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