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complexity of quicksort using insertion sort

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Upon running  quicksort on a subarray with fewer than k elements, it returns without sorting subarray. After top level call to quicksort returns, insertion sort is run on entire array to finish sorting. Then the sorting algo runs in:

O(n lg(n/k) )   O(n+ n lg(n/k))    O(nk + n lg(n/k))        none

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