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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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