For this problem, assume there are 9 adjacent seats in a row. How many different ways can 9 people be seated in them?

Q: 4 For this problem, assume there are 10 adjacent seats in a row. How many different ways can 10…

A: the number of arrangements or ways  r people seated n adjacent seats row  =nPr =n!/(n-r)!

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.