Texas Instruments TI-84 - Manual (Page 83)

Chapter 2: Math, Angle, and Test Operations 80
rand rand rand rand
rand (random number) generates and returns one or more random numbers > 0 and < 1.
To generate a list of random-numbers, specify an integer > 1 for numtrials (number of
trials). The default for numtrials is 1.
rand [ (numtrials) ]
Note: To generate random numbers beyond the range of 0 to 1, you can include rand in
an expression. For example, rand5 generates a random number > 0 and < 5.
With each rand execution, the TI-84 Plus generates the same random-number sequence
for a given seed value. The TI-84 Plus factory-set seed value for rand is 0. To generate a
different random-number sequence, store any nonzero seed value to rand . To restore
the factory-set seed value, store 0 to rand or reset the defaults (Chapter 18).
Note: The seed value also affects randInt( , randNorm( , and randBin( instructions.
nPr, nCr nPr, nCr nPr, nCr nPr, nCr
nPr (number of permutations) returns the number of permutations of items taken number at
a time. items and number must be nonnegative integers. Both items and number can be lists.
items nPr number