HP HP-20S - Probability Functions

Keys: Display: Description:
s Sets Degrees mode.
10 10.0000 Enters x.
15 Y —56.3099 Enters y, calculates r
and 6, and displays 6.
(«] 18.0278 Displays 7.
Convert the polar coordinates (7, 30°) to rectangular coordinates:
7 7.0000 Enters r.
30 (] 3.5000 Enters 6, calculates x
and y, and displays y.
=) 6.0622 Displays x.
Probability Functions
Your HP-20S can calculate factorials, combinations, and
permutations.
Factorial. Pressing [¢>][n!] calculates the factorial of the number in
the display. The number must be an integer in the range 0 through
253.
Combinations and Permutations. The keystrokes for calculating
combinations and permutations are:
n-value r-value (]
or
n-value r-value [¢>]
3: Numeric Functions 39