Chapter 2: Math, Angle, and Test Operations 80
rand
randrand
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 (Chapter18).
Note: The seed value also affects randInt(, randNorm(, and randBin( instructions.
nPr, nCr
nPr, nCrnPr, 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