The complexity of searching, inserting and deletion in AVL tree is O (log n). If height of AVL tree is h, maximum number of nodes can be 2 h+1 – 1. N (h) = N (h-1) + N (h-2) + 1 for n>2 where N (0) = 1 and N (1) = 2. The new node is added into AVL tree as the leaf node. At anytime if height difference becomes greater than 1 then tree balancing is done to restore its property. In AVL Tree, the heights of child subtrees at any node differ by at most 1. The tree can be balanced by applying rotations. Insertion in AVL tree is performed in the same way as it is performed in a binary search tree. This difference is called the Balance Factor. AVL tree checks the height of the left and the right sub-trees and assures that the difference is not more than 1. We have discussed types of questions based on AVL trees. However, it may lead to violation in the AVL tree property and therefore the tree may need balancing. 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