Four actions are to be performed in a denite order. There are ve possibilities for the first action; corresponding to each of these possibilities are two possibilities for the second action; corresponding to each of these possibilities are two possibilities for the third action; and corresponding to each of these possibilities are four possibilities for the fourth action. How many possibilities are there altogether for the four actions?

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Counting Principles

In statistics, the counting principle can be said to be the concept in which the quantity of an item is determined. There can be a single item, or a group of items, or items that are related to each other. In every possible set of items, the quantity of the possible item groups or their sorting measures can be determined with counting principles.