1- List the nodes of the left sub-tree of the root:
2- List the ancestors of node 12:
3- List the proper ancestors of node 12:
4- List the proper descendants of node 12:
5- What are the degrees of nodes 20, 16, and 10respectively?
6- List all internal nodes of the above tree:
7- Are nodes 12 and 20 siblings?
8- What are the levels of nodes 7, 12, and 15 respectively?
9- What are the heights of nodes 13, 16, and 15respectively?
10 Is the above tree full?
15 16 12
OR
PayPal Gateway not configured
OR
PayPal Gateway not configured