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Chapter 2: Math, Angle, and Test Operations 57
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 (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
nCr
(number of combinations) returns the number of combinations of items taken number at a time.
items and number must be nonnegative integers. Both items and number can be lists.
items nCr number
2: nPr
Number of permutations
3: nCr
Number of combinations
4: !
Factorial
5: randInt(
Random-integer generator
6: randNorm(
Random # from Normal distribution
7: randBin(
Random # from Binomial distribution
8: randIntNoRep(
Random ordered list of integers in a range
MATH NUM CPX PRB
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