Texas Instruments TI-73VSC Guidebook - Page 57

Chapter 2: Math Operations 51 nPr 1 " " 3 Returns the number of permutations of n items taken r number at a time. The order in which you select the items DOES matter. items and number can be nonnegative integers or lists of nonnegative integers. If both arguments are lists, they must have the same number of elements. If one argument is a list and the other a non-list, the non-list is paired with each element in the list, and a list of permutations is returned. items nPr number ³ From a group of 4 items (ABCD), how many ways can you select 2 of the items if the order does matter? Find 4 nPr 2. :41""3 2b ABCD permutations of 4 items taken 2 at a time AB AC BA BC CA CB DA DB AB and BA count AD as two BD permutations. CD DC nCr 1 " " 4 Returns the number of combinations of n items taken r number at a time. In combinations, the order in which you select the items DOES NOT matter. items and number can be nonnegative integers or lists of nonnegative integers. If both arguments are lists, they must have the same number of elements. If one argument is a list and the other a non-list, the non-list is paired with each element in the list, and a list of combinations is returned. items nCr number