Texas Instruments TI-84 PLUS SILV Guidebook - Page 65
Factorial, randInt, randNorm, integer bounds. To generate a list of random numbers
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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. value must be , L.5 and 69. value! Note: The factorial is computed recursively using the relationship (n+1)! = n...n!, until n is reduced 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 value in the syntax description above.) randInt( randInt( (random integer) generates and displays a random integer within a range specified by lower and upper integer bounds. To generate a list of random numbers, specify an integer > 1 for numtrials (number of trials); if not specified, the default is 1. randInt(lower,upper[,numtrials]) randNorm( randNorm( (random Normal) generates and displays a random real number from a specified 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