HP 20b HP 20b Calculator Quick Start Guide - Page 30
Two-Number Functions
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Mathematical Calculations function, and continue calculating with your original operation without losing your work. Two-Number Functions Apart from +-*/, the three additional two-number functions accessible on the keyboard are: Yx nCr nPr Y x is the power function; nCr stands for the number of combinations of elements, r, among n, and nPr stands for the number of permutations of elements, r, among n. nCr=n!/(r!(n-r)!) nPr=n!/(n-r)! Perform calculations with these functions in the same way you would perform calculations with +-/ and *, but press : to access the secondary function key. For example, to calculate 15 3 : 1. Press 15. 2. Press :h. 30
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Mathematical Calculations
30
function, and continue calculating with your original operation without losing your
work.
Two-Number Functions
Apart from
+-*/
, the three additional two-number functions
accessible on the keyboard are:
Y
x
nCr
nPr
Y
x
is the power function;
nCr
stands for the number of combinations of elements,
r
, among
n
, and
nPr
stands for the number of permutations of elements,
r
, among
n
.
nCr=n!/(r!(n-r)!)
nPr=n!/(n-r)!
Perform calculations with these functions in the same way you would perform
calculations with
+-/
and
*
, but press
:
to access the
secondary function key. For example, to calculate 15
3
:
1.
Press
15
.
2.
Press
:h
.