Hp 39g+ Manuel d'utilisateur télécharger pdf (Page 156)

11-12 Using mathematical functions

Probability functions

COMB Number of combinations (without regard to order) of n

things taken r at a time: n!/(r!(n-r)).

COMB(n, r)

Example

COMB(5,2) returns 10. That is, there are ten

different ways that five things can be combined two

at a time.!

Factorial of a positive integer. For non-integers, ! = Γ(x +

1). This calculates the gamma function.

value!

PERM Number of permutations (with regard to order) of n things

taken r at a time: n!/(r!(n-r)!

PERM (n, r)

Example

PERM(5,2) returns 20. That is, there are 20

different permutations of five things taken two at a

time.

RANDOM Random number (between zero and 1). Produced by a

pseudo-random number sequence. The algorithm used in

the RANDOM function uses a seed number to begin its

sequence. To ensure that two calculators must produce

different results for the RANDOM function, use the

RANDSEED function to seed different starting values

before using RANDOM to produce the numbers.

RANDOM

HINT

The setting of Time will be different for each calculator, so

using RANDSEED(Time) is guaranteed to produce a set of

numbers which are as close to random as possible. You

can set the seed using the command RANDSEED.

UTPC Upper-Tail Chi-Squared Probability given degrees of

freedom, evaluated at value. Returns the probability that

a χ

random variable is greater than value.

UTPC(degrees, value)

1 2 ... 151 152 153 154 155 156 157 158 159 160 161 ... 293 294

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Hp 39g+ Manuel d'utilisateur Page 156