Work Step by Step
A permutation from a group of items occurs when no item is used more than once and the order of arrangement makes a difference. (examples: arrangements, ordered lists, itineraries, schedules...) A combination from a group of items occurs when no item is used more than once and the order of items makes no difference. (examples: committees, subsets, groups, ...) ---- A 4-card hand are four cards you have received from the dealer, and the order in which you received them DOES NOT MATTER. (Whether you receieved, say, the ace of spades as the first card or the third card, it does not matter, it is a part of your hand either way.) Combinations.