'Task 1 choose' presentation slideshows

Unit 6: AN EXCURSION A: Reading

247 views • 24 slides

Combinations

Combinations. We should use permutation where order matters We should use combination where order does not matter. Combination : An r-element subset of an n-element set A is a combination of A, taken r at a time. Example: A = {1, 2, 3, 4} Distinct combinations of A, taken three at a time:

96 views • 6 slides