Question

How many numbers are between 100 and 999 inclusive?

Answer 1

i think you're missing a few words?

Answer 2

*including 100 and 999

Answer 3

Rule:

Number of numbers from x to y = x - y + 1


Note: x < y


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ex:

Question: How many numbers are from 67 to 195?


195 - 67 + 1 = 129

Answer:

So there are 129 numbers between 67 and 195 (including both 67 and 195)

Answer 4

amount of numbers from a to b = b-a+1
So for this case, 999-100+1 = 900
Answer: 900 numbers