Texas Instruments TI-34 II Teachers Guide - Page 88
Probability - factorial key
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Probability 11 Keys These numbered paragraphs provide explanations for the corresponding numbered keys on the illustration below. 1. H displays the following menu of functions: nPr Calculates the number of possible permutations. nCr Calculates the number of possible combinations. ! Calculates the factorial. RAND Generates a random 10-digit real number between 0 and 1. RANDI Generates a random integer between 2 numbers that you specify. Notes • The examples on the transparency masters assume all default settings. • A combination is an arrangement of objects in which the order is not important, as in a hand of cards. • A permutation is an arrangement of objects in which the order is important, as in a race. • A factorial is the product of all the positive integers from 1 to n, where n is a positive whole number 69. • To control a sequence of random numbers, you can store (L) an integer to RAND just as you would store values to memory variables. The seed value changes randomly every time a random number is generated. • For RANDI, use a comma to separate the two numbers that you specify. 1 © 1999 TEXAS INSTRUMENTS INCORPORATED TI-34 Û: A Guide for Teachers 82