#1

There is a tree with a total of 26 nodes: the root + the left subtree (which contains 20 nodes) + the right subtree (which contains 5 nodes). For preorder, inorder, and postorder traversals, how many nodes are processed before the root?

preorder

iborder

postorder

Choices 13, 5, 0, 20, 25?

#2

Assume that the variable data refers to the string "I am hungry!".

The expression len(data) evaluates to: ?

#3

Write a Python statement to create a dictionary named partners, that maps "Serena" to "Venus" and maps "Bob" to "Mike"? In these two cases "Serena" and "Bob" are the keys and "Venus" and "Mike" are the values.