Question: Write a method called countLeftNodes that returns the number of left children in the tree. A left child is a node that appears as the

Write a method called countLeftNodes that returns the number
of left children in the tree. A left child is a node that appears
as the root of the left-hand subtree of another node. For
example, reference tree #1 has 3 left children (the nodes
storing the values 5,1, and 4

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