Based on the information that the list [3, 7, 11, 15, 6, 2] has already gone through four passes of a sorting method, it is likely that the sorting method used is Bubble Sort.
Bubble Sort works by repeatedly stepping through the list, comparing adjacent elements and swapping them if they are in the wrong order. This process is repeated for a number of passes through the list until the list is sorted.
After four passes through the list, it is expected that the algorithm will have moved the larger elements closer to their correct positions at the end of the list, while still leaving some unsorted elements.
In the case of the provided list:
- After 1st pass, the largest element (15) will be in its correct position.
- After 2nd pass, the next largest element (11) will move closer to its position, and so on.
So, after four passes, the array will likely be partially sorted, but not fully organized into ascending order.
Therefore, the sorting method used was a Bubble Sort.
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