Let A,B,C⊆UA,B,C⊆U and n(U)=130n(U)=130. What are the smallest and largest possible values of n(A)? Suppose B′ contains 74 elements. How many elements does B contain? Suppose 65≤n(C)≤8765≤n(C)≤87. What are the smallest and largest possible values of n(C′)?

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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.