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      Question

      Which sorting algorithm is not stable by

      default?
      A Merge Sort Correct Answer Incorrect Answer
      B Bubble Sort Correct Answer Incorrect Answer
      C Insertion Sort Correct Answer Incorrect Answer
      D QuickSort Correct Answer Incorrect Answer
      E Counting Sort Correct Answer Incorrect Answer

      Solution

      QuickSort doesn’t guarantee order of equal elements unless modified; others (except selection sort) can be stable.

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