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     EduGorilla 
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    There are 20 pens in a bag. 4 pens are defective. Two pens are chosen at random from the bag. The probability that at least one of these is defective is

    Options :-

    1. 7/19
    2. 1/5
    3. 1/4
    4. 1/2
    5. 8/19
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