(a) How many applicants were there? (b) How many applicants did not have sales experience? (c) How many had sales experience and a college degree, but not a real estate license? (d) How many only had a real estate license?

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A: Thanks for the question :)And your upvote will be really appreciable ;)

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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.