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How many inversions does a sorted array have?

(a) 0

(b) 1

(c) 2

(d) cannot be determined

I need to ask this question from Arrays Types in chapter Arrays Types of Data Structures & Algorithms I

This question was posed to me in an interview for job.

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The correct option is (a) 0

For explanation: When an array is sorted then there cannot be any inversion in the array. As the necessary condition for an inversion is arr[i]>arr[j] and i<j.

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