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Math Help - Complementary events

  1. #1
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    Complementary events

    In a lot of 10 washing machines ,4 are defective .If one is selected at random ,what are the 2 complementary events for this experiment and what are their probabilities.

    Attempt:
    probability of selecting a defective machine-4/10
    probability of selecting a non-defective machine6/10
    1-4/10=6/10
    1-6/10=4/10

    Is my answer correct?
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