Find Missing number in an array (Unsorted and Sorted array)

This video explains how to find the missing number in both sorted as well as an unsorted array. 4 methods have been discussed. The code for XOR method is as follows:-
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[aslamshaik]

First explain the question properly, then dive into the solution/logic.

[Kushagra_]

does this works if some of the elements in the array are negative

[prakashmishra]

Great work sir . Explain code flow in slow flow.

[abdulmuhsin]

pls sir I am watching from Ghana
Pls how do you implement a binary search algorithm using the array [1, 2, 3, , 5, 6, 7, 8 ]

[tripathi]

what if the array has
A = [9.8, 6, 5, 4] and 7 is missing.

[pankajjaiswal]

Is this Xor will able to handle the negative cases?