Texas Instruments TI30XA User Manual - Page 13

Probability A combination is an arrangement of objects in which order is not important, as in a hand of cards. " i calculates the number of possible combinations of n items taken r at a time. Calculate the number of 5-card poker hands that can be dealt from a deck of 52 cards. 52 " i 5 J 2598960. A permutation is an arrangement of objects in which the order is important, as in a race. " j calculates the number of possible permutations of n items taken r at a time. Calculate the number of possible permutations for the 1st-, 2nd-, and 3rd-place finishers (no ties) in an 8horse race. 8 " j 3 J 336. A factorial is the product of the positive integers from 1 to n. (n must be a positive whole number  69). Using the digits 1, 3, 7, and 9 only one time each, how many 4-digit numbers can you form? 4 " v 24. 12