Reading material
Section 9.2 (pages 396399)
Question
Consider an AVL tree. An item is inserted. Let n1 be the
first node on the path from the inserted node to the root of the
tree that has become unbalanced because of the insertion. Below
you find a picture of the subtree rooted at the node n1.
Assume that the item has been inserted in the subtree T2.

What is the balance factor of node n1?

What is the balance factor of node n2?

What is the balance factor of node n3?