What is the order in which nodes of this tree are processed in postorder?

  • A: Z, =, Y, *, A, +, X
  • B: =, Z, +, *, X, Y, A
  • C: Y, A, *, X, Z, +, =
  • D: =, Z, +, *, Y, A, X
  • E: Z, Y, A, *, X, +, =

    Answer: E

    In postorder, the parent is processed after its children, producing a Polish postfix order for this expression.

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