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9 February, 04:05

a cog company produces 20 cogs a day, 4 of which are defective. Find the probability of selecting 4 cogs from the 20 produced where all are defective?

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  1. 9 February, 07:40
    0
    1/4845

    Step-by-step explanation:

    The probability of selecting a defective cog first is

    1/5

    The second cog is

    3/19

    The third cog is

    1/9

    And the fourth cog is

    1/17

    Multiplying these together we get

    1/5 * 3/19 * 1/9 * 1/17 = 1/4845
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