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What is the average case running time of an insertion sort algorithm?

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What is the average case running time of an insertion sort algorithm?

(a) O(N)

(b) O(N log N)

(c) O(log N)

(d) O(N^2)

I had been asked this question at a job interview.

This intriguing question comes from Insertion sort in chapter Sorting of Data Structures & Algorithms II

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Best answer
Correct choice is (d) O(N^2)

The best I can explain: The average case analysis of a tight bound algorithm is mathematically achieved to be O(N^2).

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