Question: 7. Consider the followingexpression tree +718 1 2 5 (a) What is the formula represented by the tree? (b) What is the sequence of symbols

7. Consider the followingexpression tree +718 1 2 5 (a) What is the formula represented by the tree? (b) What is the sequence of symbols that would result from a postorder traversal? (c)Suppose l want to applythe associative law on the left branch and group the addition of 7 and 2 before adding 1. What sequence of operations from the LinkedBinaryTree class would accomplish this

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