Question 395815: in a serivce center, each constumer takes a number and the numbers are consective. one day, the first constumer took the number x and the last constumer took the number y. how many consutmers visited the center on that day?
Answer by richard1234(7193)   (Show Source):
You can put this solution on YOUR website! The numbers x, x+1, ..., y were taken that day. To find the number of people who visited, we find the size of the set {x, x+1, ...y}.
Subtracting x-1 from all terms of the set this is equivalent to the set {1, 2, ..., y-x+1}. Therefore y-x+1 customers visited the service center.
Note that the answer is not simply y-x...this is because the set is inclusive.
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