Texas Instruments TI-84 PLUS - Graphing Calculator Manual Book page 65

Factorial
(factorial) returns the factorial of either an integer or a multiple of .5. For a list, it returns factorials
!
for each integer or multiple of .5. must be ‚ L.5 and  69.
value
value!
The factorial is computed recursively using the relationship (n+1)! = n...n!, until n is reduced
Note:
to either 0 or L1/2. At that point, the definition 0!=1 or the definition (L1à2)!=‡p is used to complete
the calculation. Hence:
n!=n...(nN1)...(nN2)... ... ...2...1, if n is an integer ‚ 0
n!= n...(nN1)...(nN2)... ... ...1à2...‡p, if n+1à2 is an integer ‚ 0
n! is an error, if neither n nor n+1à2 is an integer ‚ 0.
(The variable n equals in the syntax description above.)
value
randInt(
(random integer) generates and displays a random integer within a range specified by
randInt(
and integer bounds. To generate a list of random numbers, specify an integer > 1 for
lower upper
(number of trials); if not specified, the default is 1.
numtrials
randInt(lower,upper[,numtrials])
randNorm(
(random Normal) generates and displays a random real number from a specified
randNorm(
Normal distribution. Each generated value could be any real number, but most will be within the
interval [mN3(s), m+3(s)]. To generate a list of random numbers, specify an integer > 1 for
numtrials
(number of trials); if not specified, the default is 1.
randNorm( m , s [,numtrials])
Chapter 2: Math, Angle, and Test Operations 58