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(b) What is an expression tree ? Build an expression tree for the given infix expression. 20 - 9 / 3. * 2 + 1

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(b) What is an expression tree ? Build an expression tree for the given infix expression. 20 - 9 / 3. * 2 + 1 (C) Apply Heap sort technique to arrange the following numbers in sorted order. 11, 2. 9. 13. 57, 25

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