Alonzo is doing research for the city newspaper on the six topics listed below. He can choose to write about some or none of these topics. He doesn't have time to write about all of them.   Agriculture, Climate, Education, Food, Healthcare, Jobs   In how many different ways can Alonzo choose the topics he will write about? (The order of the topics chosen doesn't matter.)

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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.