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The result, 3, is calculated and displayed immediately. RPN is an efficient data entry method that eliminates the need to enter parentheses in expression. NOTE: bCalc v1.0.0 only supports postfix notation in RPN mode. For example the (infix notation) expression (4 + 5) ื 6 could be expressed in postfix notation as 4 [Enter] 5 [Enter] + [Enter] 6 [Enter] ื or 6 [Enter] 4 [Enter] 5 [Enter] + [Enter] ื |