This is hard to estimate unless we know what the desks are made out of. Usually, desks made up of aluminum and wood lasts longer than the desks just made up of wood. Filed of statistics can be useful tool to find an exact answer to this question.
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School desk vary greatly in size: from school to school and from country to country. When at school we had triple and double desks, other schools had mainly singles.
This is 6! {factorial} = 6 x 5 x 4 x 3 x 2 x 1 = 720. The way this works: take student A, who can choose any of the 6 desks, then for each of those 6 choices that student A makes, student B has 5 desks to choose from, after that choice has been made, student C has 4 desks to choose from, ... until the last student has only one to choose from.
which set of numbers is the most responsible to describe the number of desks in a classroom
One will find that the school calendar year actually lasts differently in different areas. Some school districts have a year-round academic calendar, while others may follow a typical school calendar year of September through May.
There is no indication as to how long the first trump will last, but assuredly it will last long enough for all peoples of the world to hear it.