User`s guide

Statistical Calculations

127

Example

Using five books labeled A, B, C, D, and E, how many different ways can three books be

placed on a shelf?

Table 12-15 Example calculating permutations

Combinations

The nCr function calculates the number of different sets, or combinations, of n items taken r

at a time. No item can occur more than once in the set of r items, and different orders of the

same r items are not counted separately. This is calculated using the formula:

Example

Using five colored balls, how many different color combinations of three colors can be

chosen?

Random Number and Seed

The 10bII+ includes a random number generator function that generates a pseudo-random

number in the range 0 < x < 1. To store a seed value, type a positive number and press

\w]6. Storing a value of 0 will select a random number and store it as the

seed value.

Keys Display Description

V]<D4

60.00 Calculates permutations of n

items taken r at a time.

or, using Æ:

VÆD]<

60.00

COMBINATIONS

nr–()!r!

----------------------=

Table 12-16 Example calculating combinations

Keys Display Description

V]9D4

10.00 Calculates combinations of n

items taken r at a time.

or, using Æ:

VÆD]9

10.00