Copyright 11/24/2009 Justin M Coslor Bear Wrestling, Ballroom Dancing, and Dating. The Addition Chart Possibilities Tautology applied to liesure activities. Example: Imagine there are eight contenders in a bear wrestling arena such that four bears are numbered 1, 2, 3, and 4, and four bear wrestling lumberjacks are numbered 7, 6, 5, and 4. The rules state that a bear must always wrestle a lumberjack whom they have not already wrestled, and no bear and no lumberjack may wrestle more than once. Using paired sums of the designated wrestling numbers, how many wrestling matches could take place such that the sum of their wrestling numbers equals eight, and why is that true? (BEARS + LUMBERJACKS) / 2 = W possibilities. 1 + 7 = 1 possibility 2 + 6 = 1 possibility 3 + 5 = 1 possibility 4 + 4 = 1 possibility ---------------------------------- Therefore there are four possible wrestling matches that can take place in the arena. ---------------------------------- ---------------------------- QUIZ: (see example above) ---------------------------- Imagine there are nine contenders in a ballroom dancing competition rehersal, such that there are four women labeled 1, 2, 3, and 4; and such that there are four men labeled 8, 7, 6, and 5. Now the rules state that women must always dance with men and that no man can dance with the same woman twice. What possibilities are there for couples for the ballroom dancing competition rehersal? Does this problem differ from the bear wrestling example? If so, then how? Imagine that seven single lovely women and seven well groomed single men want to go out on a somewhat blind date and all are single. For simplicity, the seven women are labeled 1, 2, 3, 4, 5, 6, 7; and the seven men are labeled 13, 12, 11, 10, 9, 8, 7. How many possibilities are there for women trading labels with each other such that they may have one somewhat enjoyable date with one particular man per woman? Why is that?