The language for this question is Java. Build the expression tree based on post fix expression. Figure out the infix expression. et.buildTree("3 4 2 * 1 5 - / +"); et.buildTree("3 4 5 * 2 / +"); et.buildTree("12 8 + 6 5 - * 3 2 - 2 3 + * /"); Thanks so much for your help!

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