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    Question

    18 defective pieces of keyboards got mixed with 165 pieces

    of non-defective keyboards. A customer comes and buys one keyboard. Find the probability of the keyboard being bought by the customer is a defective one.
    A 6/61 Correct Answer Incorrect Answer
    B 1/10 Correct Answer Incorrect Answer
    C 2/9 Correct Answer Incorrect Answer
    D 5/37 Correct Answer Incorrect Answer

    Solution

    Number of defective keyboards = 18
    Total number of keyboards = 165 + 18 = 183
    Required probability = (18/183) = (6/61)

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