# #StackBounty: #asymptotics #big-o-notation Big O notation for Average case in Linear search

### Bounty: 50

Average case complexity for linear search is (n+1)/2 i.e, half the size of input n.

The average case efficiency of an algorithm can be obtained by finding the average number of comparisons as given below:

Minimum number of comparisons = 1

Maximum number of comparisons = n

If the element not found then maximum number of comparison = n

Therefore, average number of comparisons = (n + 1)/2

Hence the average case efficiency will be expressed as O (n).(I’ve seen this in many websites…)

Here, how can we say it as O(n) in big O notation or terminology. It should be O(n/2), I suppose. Kindly clarify me

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