Given that a 7-digit phone number cannot start with 0 or 1, find the following: a) The number of all possible phone numbers in a given area code. b) The number of all such phone numbers with no repeating digits. c) The number of all such phone numbers with at least one repeating digit. d) The prob

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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.