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We can calculate combinations, permutations, and factorials with functions
COMB, PERM, and ! from the MTH/PROBABILITY.. sub-menu. The operation
of those functions is described next:
• COMB(n,r): Calculates the number of combinations of n items taken r
at a time
• PERM(n,r): Calculates the number of permutations of n items taken r
at a time
• n!: Factorial of a positive integer. For a non-integer, x! returns
Γ(x+1), where Γ(x) is the Gamma function (see Chapter 3). The
factorial symbol (!) can be entered also as the keystroke combination
~‚2
.
Example of applications of these functions are shown next: [Note: not all
lines will be visible when done with the exercises in the following figure.]
Random numbers
The calculator provides a random number generator that returns a uniformly
distributed random real number between 0 and 1. To generate a random
number, use function RAND from the MTH/PROBABILITY sub-menu. The
following screen shows a number of random numbers produced using RAND.
(Note: The random numbers in your calculator will differ from these).
Additional details on random numbers in the calculator are provided in
Chapter 17 of the user's guide. Specifically, the use of function RDZ, to re-