2-20 Math, Angle, and Test Operations
8302MATH.DOC TI-83 international English Bob Fedorisko Revised: 02/19/01 12:12 PM Printed: 02/19/01 2:27
PM Page 20 of 26
To display the MATH PRB menu, press |.
MATH NUM CPX PRB
1:rand Random-number generator
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
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)]
Tip: To generate random numbers beyond the range of 0 to 1, you
can include rand in an expression. For example, randä5 generates a
random number > 0 and < 5.
With each rand execution, the TI-83 generates the same
random-number sequence for a given seed value. The TI-83
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 (page 2.22).
MATH PRB (Probability) OperationsMATH PRB Menu
rand