Find Missing and Repeating Number in Array | 4 Approaches | Whiteboard explanation | Live coding

Explain with 4 different way to solve this problem. Each solution explained first on whiteboard then live coding on laptop.
3rd approach i.e. Index Marking approach is the best approach to solve this problem. In this approach, no need to use any extra space.
4th approach used to taking Mathematics way without updating the input array.
#Missing and repeating
#find missing and repeating number
#Immutable array
in space array
#repeating and missing