Problem. How many numbers are between two given numbers smaller than 100

How many numbers are between 70 and 75

Exemple !

How many numbers are between 9 and 14 , the correct answer is 4. Do not make the mistake of saying that the right answer is the difference of numbers which is 5, which means that you can compute the right answer by substracting one from the previous result:

14 - 9 = 5

5 - 1 = 4

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