The 7-digit numbers in each area code have the form ABC-X0X, where X, B, and C can be any digit 0-9 and A is restricted to 2-9. There are two other restrictions: •B and C cannot both equal 1 since these values are designated for other purposes such as 911 (emergency) and 411 (information), and • 555-0100 through 555-0199 are reserved for fictional uses such as in television shows or movies. According to these conditions, how many 7-digit numbers are possible in a single area code? SELECT ALL THAT APPLY Your answer: O (8-10-10-10-10-•10-10)-(8-10-10-10-10)-100 O (8-10)-(8-10) -100 O (8000000)-(80000)-100 O 7,919,900 80 000 000

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Q: ome reason the correct answer is 50178

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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.