Apply the Quick sort algorithm to the array (4, 9, 6, 7, 2, 1, 5) and show the key steps (i.e. changes in the array) that demonstrate your understanding (no need to write Java code or write detailed explanation).

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Merge sort

Merge Sort recursively sorts a given collection of numbers or elements by using the divide and conquer strategy in less time. It is one of the most used algorithms, with the worst-case time complexity of O (n log n). It was invented by John Von Neumann. The algorithm continuously divides an array into sub-arrays until each sub-array consists of a single element. It then merges those sub-arrays to produce a sorted array.