HP 20b HP 20b Calculator Quick Start Guide - Page 23

Reverse Polish Notation RPN Mode

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Mathematical Calculations  First priority: the power function (y x)  Second priority: combinations and permutations  Third priority: multiplication and division  Fourth priority: addition and subtraction For example, key in 1+2 x 5 nPr 2 2 in Algebraic mode by pressing: 1+2*5:b2:m=. The result is 241. Reverse Polish Notation (RPN) Mode To set the calculator in RPN mode, refer to the section titled, The Mode Menu: Setting Preferences. In RPN mode, numbers are entered first, separated by pressing I, followed by an operation key. Note: pressing I is optional after entering a number if the next key pressed is an operation. Each time you press an operation or function key, the answer is calculated immediately and displayed. For example, suppose you wanted to add two numbers in RPN, 1 and 2. Press 1I2+. The result, 3.00, is calculated and displayed immediately on the bottom line along with the (+) symbol on the top line. 23

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Mathematical Calculations
23
First priority: the power function (y
x
)
Second priority: combinations and permutations
Third priority: multiplication and division
Fourth priority: addition and subtraction
For example, key in 1+2 x 5 nPr 2
2
in Algebraic mode by pressing:
1+2*5:b2:m=
. The result is 241.
Reverse Polish Notation (RPN) Mode
To set the calculator in RPN mode, refer to the section titled,
The Mode Menu:
Setting Preferences.
In RPN mode, numbers are entered first, separated by pressing
I
, followed
by an operation key.
Note: pressing
I
is optional after entering a number if the next key pressed
is an operation.
Each time you press an operation or function key, the answer is calculated
immediately and displayed. For example, suppose you wanted to add two
numbers in RPN, 1 and 2. Press
1I2+
. The result,
3.00
, is
calculated and displayed immediately on the bottom line along with the (+) symbol
on the top line.