HP Prime Graphing NW280AAABA manual PERM5,2returns

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 five 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 five things taken two at a time.

PERM(5,2)returns 20.

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)

Normal Random real number with normal distribution N(μ,σ).

RANDNORM(μ,σ)

318 Functions and commands