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## Which of the following changes to typical QuickSort improves its performance on average and are generally done in practice. GATE CSE 2015

1) Randomly picking up to make worst case less

likely to occur.

2) Calling insertion sort for small sized arrays

to reduce recursive calls.

3) QuickSort is tail recursive, so tail call

optimizations can be done.

4) A linear time median searching algorithm is used

to pick the median, so that the worst case time

reduces to O(nLogn)

A=1 and 2

B=2, 3, and 4

C=1, 2 and 3

D=2, 3 and 4

By:milan-ransingh

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## Answers

Answer: (D) Explanation: The probability that more than 4 users are active a time is = (6C5 + 6C6)/26prajwalamv

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