HP Prime Graphing Wireless Calculator Instrukcja Użytkownika Pobierz pdf (Strona 406)

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101

Probability

Factorial

Factorial of a positive integer. For non-integers, x! = Γ(x + 1). This calculates the gamma function.

value!

Example:

5! returns 120

Combination

The number of combinations (without regard to order) of n things taken r at a time.

COMB(n,r)

Example: Suppose you want to know how many ways ve things can be combined two at a time.

COMB(5,2) returns 10

Permutation

Number of permutations (with regard to order) of n things taken r at a time: n!/(n–r)!.

PERM (n,r)

Example: Suppose you want to know how many permutations there are for ve things taken two at a time.

PERM(5,2) returns 20

Probability – Random

Number

Random number. With no argument, this function returns a random number between zero and one. With one

argument a, it returns a random number between 0 and a. With two arguments, a, and b, returns a random

number between a and b. With three arguments, n, a, and b, returns n random number between a and b.

RANDOM

RANDOM(a)

RANDOM(a,b)

RANDOM(n,a,b)

Integer

Random integer. With no argument, this function returns either 0 or 1 randomly. With one integer argument

a, it returns a random integer between 0 and a. With two arguments, a, and b, returns a random integer

between a and b. With three integer arguments, n, a, and b, returns n random integers between a and b.

RANDINT

RANDINT(a)

RANDINT(a,b)

RANDINT(n,a,b)

358 Chapter 22 Functions and commands

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