What does the number of inversions in an array indicate?

What does the number of inversions in an array indicate? Correct Answer measure of how close or far the array is from being sorted

The number of inversions in an array indicates how close or far the array is from being completely sorted. The array is sorted if the number of inversions are 0.
Bissoy MCQ

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A material is loaded elastically under plane stress condition given by the following tensor:
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How many inversions does a sorted array have?
Under what condition the number of inversions in an array are maximum?
Under what condition the number of inversions in an array are minimum?
The time complexity of the code that determines the number of inversions in an array using merge sort is lesser than that of the code that uses loops for the same purpose.
What is the time complexity of the code that uses merge sort for determining the number of inversions in an array?